The Info List - 3D Printing

3D printing
3D printing
refers to processes in which material is joined or solidified under computer control to create a three-dimensional object,[1] with material being added together (such as liquid molecules or powder grains being fused together). 3D printing
3D printing
is used in both rapid prototyping and additive manufacturing (AM). Objects can be of almost any shape or geometry and typically are produced using digital model data from a 3D model or another electronic data source such as an Additive Manufacturing File
(AMF) file (usually in sequential layers). There are many different technologies, like stereolithography (STL) or fused deposit modeling (FDM). Thus, unlike material removed from a stock in the conventional machining process, 3D printing
3D printing
or AM builds a three-dimensional object from computer-aided design (CAD) model or AMF file, usually by successively adding material layer by layer.[2] The term "3D printing" originally referred to a process that deposits a binder material onto a powder bed with inkjet printer heads layer by layer. More recently, the term is being used in popular vernacular to encompass a wider variety of additive manufacturing techniques. United States and global technical standards use the official term additive manufacturing for this broader sense, since the final goal of additive manufacturing is to achieve mass-production, which greatly differs from 3D printing
3D printing
for Rapid prototyping.


1 Terminology 2 History 3 General principles

3.1 Modeling 3.2 Printing 3.3 Finishing

4 Processes and printers 5 Applications 6 Legal aspects

6.1 Intellectual property 6.2 Gun legislation and administration 6.3 Aerospace Regulation

7 Health and safety

7.1 Health regulation

8 Impact

8.1 Social change

9 See also 10 References 11 Further reading 12 External links

Terminology[edit] The umbrella term additive manufacturing (AM) gained wide currency in the 2000s,[3] inspired by the theme of material being added together (in any of various ways). In contrast, the term subtractive manufacturing appeared as a retronym for the large family of machining processes with material removal as their common theme. The term 3D printing still referred only to the polymer technologies in most minds, and the term AM was likelier to be used in metalworking and end use part production contexts than among polymer, inkjet, or stereolithography enthusiasts. By the early 2010s, the terms 3D printing
3D printing
and additive manufacturing evolved senses in which they were alternate umbrella terms for AM technologies, one being used in popular vernacular by consumer-maker communities and the media, and the other used more formally by industrial AM end-use part producers, AM machine manufacturers, and global technical standards organizations. Until recently, the term 3D printing has been associated with machines low-end in price or in capability.[4] Both terms reflect that the technologies share the theme of material addition or joining throughout a 3D work envelope under automated control. Peter Zelinski, the editor-in-chief of Additive Manufacturing magazine, pointed out in 2017 that the terms are still often synonymous in casual usage[5] but that some manufacturing industry experts are increasingly making a sense distinction whereby AM comprises 3D printing
3D printing
plus other technologies or other aspects of a manufacturing process.[5] Other terms that have been used as AM synonyms or hypernyms have included desktop manufacturing, rapid manufacturing (as the logical production-level successor to rapid prototyping), and on-demand manufacturing (which echoes on-demand printing in the 2D sense of printing). That such application of the adjectives rapid and on-demand to the noun manufacturing was novel in the 2000s reveals the prevailing mental model of the long industrial era in which almost all production manufacturing involved long lead times for laborious tooling development. Today, the term subtractive has not replaced the term machining, instead complementing it when a term that covers any removal method is needed. Agile tooling
Agile tooling
is the use of modular means to design tooling that is produced by additive manufacturing or 3D printing methods, to enable quick prototyping and responses to tooling and fixture needs. Agile tooling
Agile tooling
uses a cost effective and high quality method to quickly respond to customer and market needs, and it can be used in hydro-forming, stamping, injection molding and other manufacturing processes. History[edit] Early additive manufacturing equipment and materials were developed in the 1980s.[6] In 1981, Hideo Kodama of Nagoya
Municipal Industrial Research Institute invented two additive methods for fabricating three-dimensional plastic models with photo-hardening thermoset polymer, where the UV exposure
UV exposure
area is controlled by a mask pattern or a scanning fiber transmitter.[7][8] On 16 July 1984, Alain Le Méhauté, Olivier de Witte, and Jean Claude André filed their patent for the stereolithography process.[9] The application of the French inventors was abandoned by the French General Electric
General Electric
Company (now Alcatel-Alsthom) and CILAS
(The Laser Consortium).[10] The claimed reason was "for lack of business perspective".[11] Three weeks later in 1984, Chuck Hull of 3D Systems
3D Systems
Corporation[12] filed his own patent for a stereolithography fabrication system, in which layers are added by curing photopolymers with ultraviolet light lasers. Hull defined the process as a "system for generating three-dimensional objects by creating a cross-sectional pattern of the object to be formed,".[13][14] Hull's contribution was the STL (Stereolithography) file format and the digital slicing and infill strategies common to many processes today. The technology used by most 3D printers to date—especially hobbyist and consumer-oriented models—is fused deposition modeling, a special application of plastic extrusion, developed in 1988 by S. Scott Crump and commercialized by his company Stratasys, which marketed its first FDM machine in 1992. The term 3D printing
3D printing
originally referred to a powder bed process employing standard and custom inkjet print heads, developed at MIT
in 1993 and commercialized by Soligen Technologies, Extrude Hone Corporation, and Z Corporation. The year 1993 also saw the start of a company called Solidscape, introducing a high-precision polymer jet fabrication system with soluble support structures, (categorized as a "dot-on-dot" technique). AM processes for metal sintering or melting (such as selective laser sintering, direct metal laser sintering, and selective laser melting) usually went by their own individual names in the 1980s and 1990s. At the time, all metalworking was done by processes that we now call non-additive (casting, fabrication, stamping, and machining); although plenty of automation was applied to those technologies (such as by robot welding and CNC), the idea of a tool or head moving through a 3D work envelope transforming a mass of raw material into a desired shape with a toolpath was associated in metalworking only with processes that removed metal (rather than adding it), such as CNC
milling, CNC EDM, and many others. But the automated techniques that added metal, which would later be called additive manufacturing, were beginning to challenge that assumption. By the mid-1990s, new techniques for material deposition were developed at Stanford
and Carnegie Mellon University, including microcasting[15] and sprayed materials.[16] Sacrificial and support materials had also become more common, enabling new object geometries.[17] As the various additive processes matured, it became clear that soon metal removal would no longer be the only metalworking process done through a tool or head moving through a 3D work envelope transforming a mass of raw material into a desired shape layer by layer. The 2010s were the first decade in which metal end use parts such as engine brackets[18] and large nuts[19] would be grown (either before or instead of machining) in job production rather than obligately being machined from bar stock or plate. It is still the case that casting, fabrication, stamping, and machining are more prevalent than AM in metalworking, but AM is now beginning to make significant inroads, and with the advantages of design for additive manufacturing, it is clear to engineers that much more is to come. As technology matured, several authors had begun to speculate that 3D printing could aid in sustainable development in the developing world.[20][21] General principles[edit] Modeling[edit]

model used for 3D printing

3D models are generated from 2D pictures taken at the Fantasitron 3D photo booth at Madurodam

Main article: 3D modeling 3D printable models may be created with a computer-aided design (CAD) package, via a 3D scanner, or by a plain digital camera and photogrammetry software. 3D printed models created with CAD
result in reduced errors and can be corrected before printing, allowing verification in the design of the object before it is printed.[22] The manual modeling process of preparing geometric data for 3D computer graphics is similar to plastic arts such as sculpting. 3D scanning is a process of collecting digital data on the shape and appearance of a real object, creating a digital model based on it. Printing[edit]

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Timelapse video of a hyperboloid object (designed by George W. Hart) made of PLA using a RepRap "Prusa Mendel" 3D printer for molten polymer deposition

Before printing a 3D model from an STL file, it must first be examined for errors. Most CAD
applications produce errors in output STL files,[23][24] of the following types:

holes; faces normals; self-intersections; noise shells; manifold errors.[25]

A step in the STL generation known as "repair" fixes such problems in the original model.[26][27] Generally STLs that have been produced from a model obtained through 3D scanning often have more of these errors.[28] This is due to how 3D scanning works-as it is often by point to point acquisition, reconstruction will include errors in most cases.[29] Once completed, the STL file needs to be processed by a piece of software called a "slicer," which converts the model into a series of thin layers and produces a G-code
file containing instructions tailored to a specific type of 3D printer (FDM printers).[citation needed] This G-code
file can then be printed with 3D printing
3D printing
client software (which loads the G-code, and uses it to instruct the 3D printer during the 3D printing
3D printing
process). Printer resolution describes layer thickness and X–Y resolution in dots per inch (dpi) or micrometers (µm). Typical layer thickness is around 100 μm (250 DPI), although some machines can print layers as thin as 16 μm (1,600 DPI).[30] X–Y resolution is comparable to that of laser printers. The particles (3D dots) are around 50 to 100 μm (510 to 250 DPI) in diameter.[citation needed] For that printer resolution, specifying a mesh resolution of 0.01–0.03 mm and a chord length ≤ 0.016 mm generate an optimal STL output file for a given model input file.[31] Specifying higher resolution results in larger files without increase in print quality. Construction of a model with contemporary methods can take anywhere from several hours to several days, depending on the method used and the size and complexity of the model. Additive systems can typically reduce this time to a few hours, although it varies widely depending on the type of machine used and the size and number of models being produced simultaneously.[32] Traditional techniques like injection moulding can be less expensive for manufacturing polymer products in high quantities, but additive manufacturing can be faster, more flexible and less expensive when producing relatively small quantities of parts. 3D printers give designers and concept development teams the ability to produce parts and concept models using a desktop size printer.[33] Seemingly paradoxic, more complex objects can be cheaper for 3D printing production than less complex objects.[citation needed] Finishing[edit] Though the printer-produced resolution is sufficient for many applications, printing a slightly oversized version of the desired object in standard resolution and then removing material[34] with a higher-resolution subtractive process can achieve greater precision. Some printable polymers such as ABS, allow the surface finish to be smoothed and improved using chemical vapor processes[35] based on acetone or similar solvents. Some additive manufacturing techniques are capable of using multiple materials in the course of constructing parts. These techniques are able to print in multiple colors and color combinations simultaneously, and would not necessarily require painting. Some printing techniques require internal supports to be built for overhanging features during construction. These supports must be mechanically removed or dissolved upon completion of the print. All of the commercialized metal 3D printers involve cutting the metal component off the metal substrate after deposition. A new process for the GMAW
3D printing
3D printing
allows for substrate surface modifications to remove aluminum[36] or steel.[37] Processes and printers[edit] Main article: 3D printing
3D printing

This section should include only a brief summary of 3D printing processes. See:Summary style for information on how to properly incorporate it into this article's main text. (August 2017)

Schematic representation of the 3D printing
3D printing
technique known as Fused Filament Fabrication; a filament a) of plastic material is fed through a heated moving head b) that melts and extrudes it depositing it, layer after layer, in the desired shape c). A moving platform e) lowers after each layer is deposited. For this kind of technology additional vertical support structures d) are needed to sustain overhanging parts

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A timelapse video of a robot model (logo of Make magazine) being printed using FDM on a RepRapPro Fisher printer.

A large number of additive processes are available. The main differences between processes are in the way layers are deposited to create parts and in the materials that are used. Each method has its own advantages and drawbacks, which is why some companies offer a choice of powder and polymer for the material used to build the object.[38] Others sometimes use standard, off-the-shelf business paper as the build material to produce a durable prototype. The main considerations in choosing a machine are generally speed, costs of the 3D printer, of the printed prototype, choice and cost of the materials, and color capabilities.[39] Printers that work directly with metals are generally expensive. However less expensive printers can be used to make a mold, which is then used to make metal parts.[40] ISO/ASTM52900-15 defines seven categories of Additive Manufacturing (AM) processes within its meaning: binder jetting, directed energy deposition, material extrusion, material jetting, powder bed fusion, sheet lamination, and vat photopolymerization.[41] Some methods melt or soften the material to produce the layers. In Fused filament fabrication, also known as Fused deposition modeling (FDM), the model or part is produced by extruding small beads or streams of material which harden immediately to form layers. A filament of thermoplastic, metal wire, or other material is fed into an extrusion nozzle head (3D printer extruder), which heats the material and turns the flow on and off. FDM is somewhat restricted in the variation of shapes that may be fabricated. Another technique fuses parts of the layer and then moves upward in the working area, adding another layer of granules and repeating the process until the piece has built up. This process uses the unfused media to support overhangs and thin walls in the part being produced, which reduces the need for temporary auxiliary supports for the piece.[42] Laser
sintering techniques include selective laser sintering, with both metals and polymers, and direct metal laser sintering.[43] Selective laser melting
Selective laser melting
does not use sintering for the fusion of powder granules but will completely melt the powder using a high-energy laser to create fully dense materials in a layer-wise method that has mechanical properties similar to those of conventional manufactured metals. Electron beam melting
Electron beam melting
is a similar type of additive manufacturing technology for metal parts (e.g. titanium alloys). EBM manufactures parts by melting metal powder layer by layer with an electron beam in a high vacuum.[44][45] Another method consists of an inkjet 3D printing
3D printing
system, which creates the model one layer at a time by spreading a layer of powder (plaster, or resins) and printing a binder in the cross-section of the part using an inkjet-like process. With laminated object manufacturing, thin layers are cut to shape and joined together.

Schematic representation of Stereolithography; a light-emitting device a) (laser or DLP) selectively illuminate the transparent bottom c) of a tank b) filled with a liquid photo-polymerizing resin; the solidified resin d) is progressively dragged up by a lifting platform e)

Other methods cure liquid materials using different sophisticated technologies, such as stereolithography. Photopolymerization
is primarily used in stereolithography to produce a solid part from a liquid. Inkjet printer
Inkjet printer
systems like the Objet PolyJet system spray photopolymer materials onto a build tray in ultra-thin layers (between 16 and 30 µm) until the part is completed. Each photopolymer layer is cured with UV light after it is jetted, producing fully cured models that can be handled and used immediately, without post-curing. Ultra-small features can be made with the 3D micro-fabrication technique used in multiphoton photopolymerisation. Due to the nonlinear nature of photo excitation, the gel is cured to a solid only in the places where the laser was focused while the remaining gel is then washed away. Feature sizes of under 100 nm are easily produced, as well as complex structures with moving and interlocked parts.[46] Yet another approach uses a synthetic resin that is solidified using LEDs.[47] In Mask-image-projection-based stereolithography, a 3D digital model is sliced by a set of horizontal planes. Each slice is converted into a two-dimensional mask image. The mask image is then projected onto a photocurable liquid resin surface and light is projected onto the resin to cure it in the shape of the layer.[48] Continuous liquid interface production begins with a pool of liquid photopolymer resin. Part of the pool bottom is transparent to ultraviolet light (the "window"), which causes the resin to solidify. The object rises slowly enough to allow resin to flow under and maintain contact with the bottom of the object.[49] In powder-fed directed-energy deposition, a high-power laser is used to melt metal powder supplied to the focus of the laser beam. The powder fed directed energy process is similar to Selective Laser
Sintering, but the metal powder is applied only where material is being added to the part at that moment.[50][51] As of December 2017, additive manufacturing systems were on the market that ranged from $99 to $500,000 in price and were employed in industries including aerospace, architecture, automotive, defense, and medical replacements, among many others. For example, General Electric uses the high-end model to build parts for turbines.[52] Many of these systems are used for rapid prototyping, before mass production methods are employed. Higher education has proven to be a major buyer of desktop and professional 3D printers which industry experts generally view as a positive indicator.[53] Libraries around the world have also become locations to house smaller 3D printers for educational and community access.[54] Several projects and companies are making efforts to develop affordable 3D printers for home desktop use. Much of this work has been driven by and targeted at DIY/Maker/enthusiast/early adopter communities, with additional ties to the academic and hacker communities.[55] Applications[edit] Main article: Applications of 3D printing

The Audi RSQ
Audi RSQ
was made with rapid prototyping industrial KUKA

A 3D selfie
3D selfie
in 1:20 scale printed by Shapeways
using gypsum-based printing

A Jet Engine turbine printed from the Howard Community College Makerbot.

3D printed enamelled pottery.

3D printed sculpture of the Egyptian Pharaoh Merankhre Mentuhotep shown at Threeding

In the current scenario, 3D printing
3D printing
or AM has been used in manufacturing, medical, industry and sociocultural sectors which facilitate 3D printing
3D printing
or AM to become successful commercial technology.[56] The earliest application of additive manufacturing was on the toolroom end of the manufacturing spectrum. For example, rapid prototyping was one of the earliest additive variants, and its mission was to reduce the lead time and cost of developing prototypes of new parts and devices, which was earlier only done with subtractive toolroom methods such as CNC
milling, turning, and precision grinding.[57] In the 2010s, additive manufacturing entered production to a much greater extent. Additive manufacturing
Additive manufacturing
of food is being developed by squeezing out food, layer by layer, into three-dimensional objects. A large variety of foods are appropriate candidates, such as chocolate and candy, and flat foods such as crackers, pasta,[58] and pizza.[59][60] 3D printing
3D printing
has entered the world of clothing, with fashion designers experimenting with 3D-printed bikinis, shoes, and dresses.[61] In commercial production Nike is using 3D printing
3D printing
to prototype and manufacture the 2012 Vapor Laser
Talon football shoe for players of American football, and New Balance is 3D manufacturing custom-fit shoes for athletes.[61][62] 3D printing
3D printing
has come to the point where companies are printing consumer grade eyewear with on-demand custom fit and styling (although they cannot print the lenses). On-demand customization of glasses is possible with rapid prototyping.[63] Vanessa Friedman, fashion director and chief fashion critic at The New York Times, says 3D printing
3D printing
will have a significant value for fashion companies down the road, especially if it transforms into a print-it-yourself tool for shoppers. "There's real sense that this is not going to happen anytime soon," she says, "but it will happen, and it will create dramatic change in how we think both about intellectual property and how things are in the supply chain." She adds: "Certainly some of the fabrications that brands can use will be dramatically changed by technology."[64] In cars, trucks, and aircraft, AM is beginning to transform both (1) unibody and fuselage design and production and (2) powertrain design and production. For example:

In early 2014, Swedish supercar manufacturer Koenigsegg
announced the One:1, a supercar that utilizes many components that were 3D printed.[65] Urbee
is the name of the first car in the world car mounted using the technology 3D printing
3D printing
(its bodywork and car windows were "printed").[66][67][68] In 2014, Local Motors
Local Motors
debuted Strati, a functioning vehicle that was entirely 3D Printed using ABS plastic and carbon fiber, except the powertrain.[69] In May 2015 Airbus announced that its new Airbus A350 XWB included over 1000 components manufactured by 3D printing.[70] In 2015, a Royal Air Force
Royal Air Force
Eurofighter Typhoon
Eurofighter Typhoon
fighter jet flew with printed parts. The United States Air Force
United States Air Force
has begun to work with 3D printers, and the Israeli Air Force
Israeli Air Force
has also purchased a 3D printer to print spare parts.[71] In 2017, GE Aviation
GE Aviation
revealed that it had used design for additive manufacturing to create a helicopter engine with 16 parts instead of 900, with great potential impact on reducing the complexity of supply chains.[72]

AM's impact on firearms involves two dimensions: new manufacturing methods for established companies, and new possibilities for the making of do-it-yourself firearms. In 2012, the US-based group Defense Distributed disclosed plans to design a working plastic 3D printed firearm "that could be downloaded and reproduced by anybody with a 3D printer."[73][74] After Defense Distributed
Defense Distributed
released their plans, questions were raised regarding the effects that 3D printing
3D printing
and widespread consumer-level CNC
machining[75][76] may have on gun control effectiveness.[77][78][79][80] Surgical uses of 3D printing-centric therapies have a history beginning in the mid-1990s with anatomical modeling for bony reconstructive surgery planning.[81] Patient-matched implants were a natural extension of this work, leading to truly personalized implants that fit one unique individual.[82] Virtual planning of surgery and guidance using 3D printed, personalized instruments have been applied to many areas of surgery including total joint replacement and craniomaxillofacial reconstruction with great success.[83] One example of this is the bioresorbable trachial splint to treat newborns with tracheobronchomalacia [84] developed at the University of Michigan. The use of additive manufacturing for serialized production of orthopedic implants (metals) is also increasing due to the ability to efficiently create porous surface structures that facilitate osseointegration. The hearing aid and dental industries are expected to be the biggest area of future development using the custom 3D printing technology.[85] In March 2014, surgeons in Swansea used 3D printed parts to rebuild the face of a motorcyclist who had been seriously injured in a road accident.[86] As of 2012[update], 3D bio-printing technology has been studied by biotechnology firms and academia for possible use in tissue engineering applications in which organs and body parts are built using inkjet techniques. In this process, layers of living cells are deposited onto a gel medium or sugar matrix and slowly built up to form three-dimensional structures including vascular systems.[87] Recently, a heart-on-chip has been created which matches properties of cells.[88] In 2005, academic journals had begun to report on the possible artistic applications of 3D printing
3D printing
technology.[89] As of 2017, domestic 3D printing
3D printing
was reaching a consumer audience beyond hobbyists and enthusiasts. Off the shelf machines were incerasingly capable of producing practical household applications, for example, ornamental objects. Some practical examples include a working clock[90] and gears printed for home woodworking machines among other purposes.[91] Web sites associated with home 3D printing
3D printing
tended to include backscratchers, coat hooks, door knobs, etc.[92] 3D printing, and open source 3D printers in particular, are the latest technology making inroads into the classroom.[93][94][95] Some authors have claimed that 3D printers offer an unprecedented "revolution" in STEM education.[96] The evidence for such claims comes from both the low cost ability for rapid prototyping in the classroom by students, but also the fabrication of low-cost high-quality scientific equipment from open hardware designs forming open-source labs.[97] Future applications for 3D printing
3D printing
might include creating open-source scientific equipment.[97][98] In the last several years 3D printing
3D printing
has been intensively used by in the cultural heritage field for preservation, restoration and dissemination purposes.[99] Many Europeans and North American Museums have purchased 3D printers and actively recreate missing pieces of their relics.[100] The Metropolitan Museum of Art
Metropolitan Museum of Art
and the British Museum have started using their 3D printers to create museum souvenirs that are available in the museum shops.[101] Other museums, like the National Museum of Military History and Varna Historical Museum, have gone further and sell through the online platform Threeding
digital models of their artifacts, created using Artec 3D
Artec 3D
scanners, in 3D printing friendly file format, which everyone can 3D print at home.[102] 3D printed soft actuators is a growing application of 3D printing technology which has found its place in the 3D printing
3D printing
applications. These soft actuators are being developed to deal with soft structures and organs especially in biomedical sectors and where the interaction between human and robot is inevitable. The majority of the existing soft actuators are fabricated by conventional methods that require manual fabrication of devices, post processing/assembly, and lengthy iterations until maturity in the fabrication is achieved. To avoid the tedious and time-consuming aspects of the current fabrication processes, researchers are exploring an appropriate manufacturing approach for effective fabrication of soft actuators. Thus, 3D printed soft actuators are introduced to revolutionise the design and fabrication of soft actuators with custom geometrical, functional, and control properties in a faster and inexpensive approach. They also enable incorporation of all actuator components into a single structure eliminating the need to use external joints, adhesives, and fasteners.[103] Legal aspects[edit] Intellectual property[edit] See also: Free hardware 3D printing
3D printing
has existed for decades within certain manufacturing industries where many legal regimes, including patents, industrial design rights, copyright, and trademark may apply. However, there is not much jurisprudence to say how these laws will apply if 3D printers become mainstream and individuals and hobbyist communities begin manufacturing items for personal use, for non-profit distribution, or for sale. Any of the mentioned legal regimes may prohibit the distribution of the designs used in 3D printing, or the distribution or sale of the printed item. To be allowed to do these things, where an active intellectual property was involved, a person would have to contact the owner and ask for a licence, which may come with conditions and a price. However, many patent, design and copyright laws contain a standard limitation or exception for 'private', 'non-commercial' use of inventions, designs or works of art protected under intellectual property (IP). That standard limitation or exception may leave such private, non-commercial uses outside the scope of IP rights. Patents cover inventions including processes, machines, manufactures, and compositions of matter and have a finite duration which varies between countries, but generally 20 years from the date of application. Therefore, if a type of wheel is patented, printing, using, or selling such a wheel could be an infringement of the patent.[104] Copyright
covers an expression[105] in a tangible, fixed medium and often lasts for the life of the author plus 70 years thereafter.[106] If someone makes a statue, they may have copyright on the look of that statue, so if someone sees that statue, they cannot then distribute designs to print an identical or similar statue. When a feature has both artistic (copyrightable) and functional (patentable) merits, when the question has appeared in US court, the courts have often held the feature is not copyrightable unless it can be separated from the functional aspects of the item.[106] In other countries the law and the courts may apply a different approach allowing, for example, the design of a useful device to be registered (as a whole) as an industrial design on the understanding that, in case of unauthorized copying, only the non-functional features may be claimed under design law whereas any technical features could only be claimed if covered by a valid patent. Gun legislation and administration[edit] Main article: 3D printed firearms The US Department of Homeland Security and the Joint
Regional Intelligence Center released a memo stating that "significant advances in three-dimensional (3D) printing capabilities, availability of free digital 3D printable files for firearms components, and difficulty regulating file sharing may present public safety risks from unqualified gun seekers who obtain or manufacture 3D printed guns," and that "proposed legislation to ban 3D printing
3D printing
of weapons may deter, but cannot completely prevent their production. Even if the practice is prohibited by new legislation, online distribution of these 3D printable files will be as difficult to control as any other illegally traded music, movie or software files."[107] Attempting to restrict the distribution over the Internet of gun plans has been likened to the futility of preventing the widespread distribution of DeCSS
which enabled DVD ripping.[108][109][110][111] After the US government had Defense Distributed
Defense Distributed
take down the plans, they were still widely available via The Pirate Bay
The Pirate Bay
and other file sharing sites.[112] Downloads of the plans from the UK, Germany, Spain, and Brazil were heavy.[113][114] Some US legislators have proposed regulations on 3D printers, to prevent them being used for printing guns.[115][116] 3D printing
3D printing
advocates have suggested that such regulations would be futile, could cripple the 3D printing industry, and could infringe on free speech rights, with early pioneer of 3D printing
3D printing
Professor Hod Lipson
Hod Lipson
suggesting that gunpowder could be controlled instead.[117][118][119][120][121][122][123] Internationally, where gun controls are generally stricter than in the United States, some commentators have said the impact may be more strongly felt, as alternative firearms are not as easily obtainable.[124] Officials in the United Kingdom have noted that producing a 3D printed gun would be illegal under their gun control laws.[125] Europol
stated that criminals have access to other sources of weapons, but noted that as the technology improved the risks of an effect would increase.[126][127] Aerospace Regulation[edit] See also: Aircraft Parts In the United States, the FAA has anticipated a desire to use additive manufacturing techniques and has been considering how best to regulate this process.[128] The FAA has jurisdiction over such fabrication because all aircraft parts must be made under FAA production approval or under other FAA regulatory categories.[129] In December 2016, the FAA approved the production of a 3D printed fuel nozzle for the GE LEAP engine.[130] Aviation
attorney Jason Dickstein has suggested that additive manufacturing is merely a production method, and should be regulated like any other production method.[131][132] He has suggested that the FAA's focus should be on guidance to explain compliance, rather than on changing the existing rules, and that existing regulations and guidance permit a company "to develop a robust quality system that adequately reflects regulatory needs for quality assurance."[131] As of January 2018 Health and safety[edit]

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A video on research done on printer emissions

See also: Health and safety hazards of nanomaterials Research on the health and safety concerns of 3D printing
3D printing
is new and in development due to the recent proliferation of 3D printing
3D printing
devices. In 2017 the European Agency for Safety and Health at Work
European Agency for Safety and Health at Work
has published a discussion paper on the processes and materials involved in 3D printing, potential implications of this technology for occupational safety and health and avenues for controlling potential hazards.[133] Most concerns involve gas and material exposures, in particular nanomaterials, material handling, static electricity, moving parts and pressures.[134] A National Institute for Occupational Safety and Health
National Institute for Occupational Safety and Health
(NIOSH) study noted particle emissions from a fused filament peaked a few minutes after printing started and returned to baseline levels 100 minutes after printing ended.[135] Emissions from fused filament printers can include a large number of ultrafine particles and volatile organic compounds (VOCs).[135][136][137] The toxicity from emissions varies by source material due to differences in size, chemical properties, and quantity of emitted particles.[135] Excessive exposure to VOCs can lead to irritation of the eyes, nose, and throat, headache, loss of coordination, and nausea and some of the chemical emissions of fused filament printers have also been linked to asthma.[135][138] Based on animal studies, carbon nanotubes and carbon nanofibers sometimes used in fused filament printing can cause pulmonary effects including inflammation, granulomas, and pulmonary fibrosis when at the nanoparticle size.[139] Carbon nanoparticle emissions and processes using powder metals are highly combustible and raise the risk of dust explosions.[140] At least one case of severe injury was noted from an explosion involved in metal powders used for fused filament printing.[141] Other general health and safety concerns include the hot surface of UV lamps and print head blocks, high voltage, ultraviolet radiation from UV lamps, and potential for mechanical injury from moving parts.[142] The problems noted in the NIOSH report were reduced by using manufacturer-supplied covers and full enclosures, using proper ventilation, keeping workers away from the printer, using respirators, turning off the printer if it jammed, and using lower emission printers and filaments.[135] At least one case of severe injury was noted from an explosion involved in metal powders used for fused filament.[135] Personal protective equipment
Personal protective equipment
has been found to be the least desirable control method with a recommendation that it only be used to add further protection in combination with approved emissions protection.[135] Hazards to health and safety also exist from post-processing activities done to finish parts after they have been printed. These post-processing activities can include chemical baths, sanding, polishing, or vapor exposure to refine surface finish, as well as general subtractive manufacturing techniques such as drilling, milling, or turning to modify the printed geometry.[143] Any technique that removes material from the printed part has the potential to generate particles that can be inhaled or cause eye injury if proper personal protective equipment is not used, such as respirators or safety glasses. Caustic baths are often used to dissolve support material used by some 3D printers that allows them to print more complex shapes. These baths require personal protective equipment to prevent injury to exposed skin.[142] Health regulation[edit] Although no occupational exposure limits specific to 3D printer emissions exist, certain source materials used in 3D printing, such as carbon nanofiber and carbon nanotubes, have established occupational exposure limits at the nanoparticle size.[144][135] Impact[edit] Additive manufacturing, starting with today's infancy period, requires manufacturing firms to be flexible, ever-improving users of all available technologies to remain competitive. Advocates of additive manufacturing also predict that this arc of technological development will counter globalization, as end users will do much of their own manufacturing rather than engage in trade to buy products from other people and corporations.[6] The real integration of the newer additive technologies into commercial production, however, is more a matter of complementing traditional subtractive methods rather than displacing them entirely.[145] The futurologist Jeremy Rifkin[146] claimed that 3D printing
3D printing
signals the beginning of a third industrial revolution,[147] succeeding the production line assembly that dominated manufacturing starting in the late 19th century. Social change[edit] Since the 1950s, a number of writers and social commentators have speculated in some depth about the social and cultural changes that might result from the advent of commercially affordable additive manufacturing technology.[148] Amongst the more notable ideas to have emerged from these inquiries has been the suggestion that, as more and more 3D printers start to enter people's homes, the conventional relationship between the home and the workplace might get further eroded.[149] Likewise, it has also been suggested that, as it becomes easier for businesses to transmit designs for new objects around the globe, so the need for high-speed freight services might also become less.[150] Finally, given the ease with which certain objects can now be replicated, it remains to be seen whether changes will be made to current copyright legislation so as to protect intellectual property rights with the new technology widely available. As 3D printers became more accessible to consumers, online social platforms have developed to support the community.[151] This includes websites that allow users to access information such as how to build a 3D printer, as well as social forums that discuss how to improve 3D print quality and discuss 3D printing
3D printing
news, as well as social media websites that are dedicated to share 3D models.[152][153][154] RepRap is a wiki based website that was created to hold all information on 3d printing, and has developed into a community that aims to bring 3D printing to everyone. Furthermore, there are other sites such as Pinshape, Thingiverse and MyMiniFactory, which were created initially to allow users to post 3D files for anyone to print, allowing for decreased transaction cost of sharing 3D files. These websites have allowed greater social interaction between users, creating communities dedicated to 3D printing. Some call attention to the conjunction of Commons-based peer production with 3D printing
3D printing
and other low-cost manufacturing techniques.[155][156][157] The self-reinforced fantasy of a system of eternal growth can be overcome with the development of economies of scope, and here, society can play an important role contributing to the raising of the whole productive structure to a higher plateau of more sustainable and customized productivity.[155] Further, it is true that many issues, problems, and threats arise due to the democratization of the means of production, and especially regarding the physical ones.[155] For instance, the recyclability of advanced nanomaterials is still questioned; weapons manufacturing could become easier; not to mention the implications for counterfeiting[158] and on IP.[159] It might be maintained that in contrast to the industrial paradigm whose competitive dynamics were about economies of scale, Commons-based peer production
Commons-based peer production
3D printing
3D printing
could develop economies of scope. While the advantages of scale rest on cheap global transportation, the economies of scope share infrastructure costs (intangible and tangible productive resources), taking advantage of the capabilities of the fabrication tools.[155] And following Neil Gershenfeld[160] in that "some of the least developed parts of the world need some of the most advanced technologies," Commons-based peer production and 3D printing
3D printing
may offer the necessary tools for thinking globally but acting locally in response to certain needs. Larry Summers
Larry Summers
wrote about the "devastating consequences" of 3D printing and other technologies (robots, artificial intelligence, etc.) for those who perform routine tasks. In his view, "already there are more American men on disability insurance than doing production work in manufacturing. And the trends are all in the wrong direction, particularly for the less skilled, as the capacity of capital embodying artificial intelligence to replace white-collar as well as blue-collar work will increase rapidly in the years ahead." Summers recommends more vigorous cooperative efforts to address the "myriad devices" (e.g., tax havens, bank secrecy, money laundering, and regulatory arbitrage) enabling the holders of great wealth to "avoid paying" income and estate taxes, and to make it more difficult to accumulate great fortunes without requiring "great social contributions" in return, including: more vigorous enforcement of anti-monopoly laws, reductions in "excessive" protection for intellectual property, greater encouragement of profit-sharing schemes that may benefit workers and give them a stake in wealth accumulation, strengthening of collective bargaining arrangements, improvements in corporate governance, strengthening of financial regulation to eliminate subsidies to financial activity, easing of land-use restrictions that may cause the real estate of the rich to keep rising in value, better training for young people and retraining for displaced workers, and increased public and private investment in infrastructure development—e.g., in energy production and transportation.[161] Michael Spence
Michael Spence
wrote that "Now comes a … powerful, wave of digital technology that is replacing labor in increasingly complex tasks. This process of labor substitution and disintermediation has been underway for some time in service sectors—think of ATMs, online banking, enterprise resource planning, customer relationship management, mobile payment systems, and much more. This revolution is spreading to the production of goods, where robots and 3D printing
3D printing
are displacing labor." In his view, the vast majority of the cost of digital technologies comes at the start, in the design of hardware (e.g. 3D printers) and, more important, in creating the software that enables machines to carry out various tasks. "Once this is achieved, the marginal cost of the hardware is relatively low (and declines as scale rises), and the marginal cost of replicating the software is essentially zero. With a huge potential global market to amortize the upfront fixed costs of design and testing, the incentives to invest [in digital technologies] are compelling."[162] Spence believes that, unlike prior digital technologies, which drove firms to deploy underutilized pools of valuable labor around the world, the motivating force in the current wave of digital technologies "is cost reduction via the replacement of labor." For example, as the cost of 3D printing
3D printing
technology declines, it is "easy to imagine" that production may become "extremely" local and customized. Moreover, production may occur in response to actual demand, not anticipated or forecast demand. Spence believes that labor, no matter how inexpensive, will become a less important asset for growth and employment expansion, with labor-intensive, process-oriented manufacturing becoming less effective, and that re-localization will appear in both developed and developing countries. In his view, production will not disappear, but it will be less labor-intensive, and all countries will eventually need to rebuild their growth models around digital technologies and the human capital supporting their deployment and expansion. Spence writes that "the world we are entering is one in which the most powerful global flows will be ideas and digital capital, not goods, services, and traditional capital. Adapting to this will require shifts in mindsets, policies, investments (especially in human capital), and quite possibly models of employment and distribution."[162] Naomi Wu
Naomi Wu
regards the usage of 3D printing
3D printing
in the Chinese classroom (where rote memorization is standard) to teach design principles and creativity as the most exciting recent development of the technology, and more generally regards 3D printing
3D printing
as being the next desktop publishing revolution.[163] See also[edit]

3D bioprinting 3D Manufacturing Format Actuator Additive Manufacturing File
Format AstroPrint Cloud manufacturing Computer numeric control Fusion3 Laser
cutting Limbitless Solutions List of 3D printer manufacturers List of common 3D test models List of emerging technologies List of notable 3D printed weapons and parts Magnetically assisted slip casting MakerBot
Industries Milling center Organ-on-a-chip Self-replicating machine Ultimaker Volumetric printing


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Wire. Archived from the original on 19 May 2013. Retrieved 2013-10-30.  ^ "News". European Plastics News. Retrieved 2013-10-30.  ^ Cochrane, Peter (21 May 2013). "Peter Cochrane's Blog: Beyond 3D Printed Guns". TechRepublic. Retrieved 2013-10-30.  ^ Gilani, Nadia (6 May 2013). "Gun factory fears as 3D blueprints put online by Defense Distributed". Metro.co.uk. Retrieved 2013-10-30.  ^ "Liberator: First 3D-printed gun sparks gun control controversy". Digitaljournal.com. Retrieved 2013-10-30.  ^ "First 3D Printed Gun 'The Liberator' Successfully Fired". International Business Times UK. 7 May 2013. Archived from the original on 29 October 2013. Retrieved 2013-10-30.  ^ Debra Werner, FAA prepares guidance for wave of 3D-printed aerospace parts (October 20, 2017) ^ 14 C.F.R. § 21.9(a) ^ Beau Jackson, FAA to launch eight-year additive manufacturing road map (October 21, 2017) ^ a b Jason Dickstein, Additive Manufacturing – Does it Fit into the Regulations?, ARSA Hotline (May 5, 2017) (explaining how to treat additive manufacturing under the FAA's existing production regulations) ^ See Brett Levanto, Embracing Drones and 3D Printing In The Regulatory Framework, MRO Network (Jan 10, 2018) (describing the Dickstein article) ^ EU-OSHA, European Agency for Safety and Health (7 June 2017). "3D Printing and monitoring of workers: a new industrial revolution?". osha.europa.eu. Archived from the original on 7 June 2017. Retrieved 2017-10-31.  ^ Fuges, Christina M. "Changing the Rules". www.additivemanufacturing.media. Retrieved 2017-10-30.  ^ a b c d e f g h "Control Measures Critical for 3D Printers". NIOSH Research Rounds. U.S. National Institute for Occupational Safety and Health. June 2016. Retrieved 2017-07-03.  ^ Azimi, Parham; Zhao, Dan; Pouzet, Claire; Crain, Neil E.; Stephens, Brent (2 February 2016). "Emissions of Ultrafine Particles and Volatile Organic Compounds from Commercially Available Desktop Three-Dimensional Printers with Multiple Filaments". Environmental Science & Technology. 50 (3): 1260–1268. Bibcode:2016EnST...50.1260A. doi:10.1021/acs.est.5b04983. ISSN 0013-936X.  ^ Stefaniak, Aleksandr B.; LeBouf, Ryan F.; Yi, Jinghai; Ham, Jason; Nurkewicz, Timothy; Schwegler-Berry, Diane E.; Chen, Bean T.; Wells, J. Raymond; Duling, Matthew G. (3 July 2017). "Characterization of chemical contaminants generated by a desktop fused deposition modeling 3-dimensional Printer". Journal of Occupational and Environmental Hygiene. 14 (7): 540–550. doi:10.1080/15459624.2017.1302589. ISSN 1545-9624. PMID 28440728.  ^ "Is 3D Printing Safe". American Industrial Hygiene Association. 3 May 2017. Retrieved 2017-07-29.  ^ "Current Intelligence Bulletin 65: Occupational Exposure to Carbon Nanotubes and Nanofibers". U.S. National Institute for Occupational Safety and Health. 2013. Retrieved 2017-06-20.  ^ Turkevich, Leonid A.; Fernback, Joseph; Dastidar, Ashok G.; Osterberg, Paul (1 May 2016). "Potential explosion hazard of carbonaceous nanoparticles: screening of allotropes". Combustion and Flame. 167: 218–227. doi:10.1016/j.combustflame.2016.02.010.  ^ "After explosion, US Department of Labor's OSHA cites 3-D printing firm for exposing workers to combustible metal powder, electrical hazards". U.S. Occupational Safety and Health Administration. 20 May 2014. Retrieved 2017-07-03.  ^ a b "3D Printing Safety" (PDF). Carnegie Mellon University Environmental Heath & Safety.  ^ "Ultimate Guide to Finishing 3D Printed Parts Fictiv - Hardware Guide". www.fictiv.com. Retrieved 2017-10-19.  ^ Dahm, Matthew M.; Evans, Douglas E.; Schubauer-Berigan, Mary K.; Birch, Eileen M.; Fernback, Joseph E. (1 July 2012). "Occupational Exposure Assessment in Carbon Nanotube and Nanofiber Primary and Secondary Manufacturers". The Annals of Occupational Hygiene. 56 (5). doi:10.1093/annhyg/mer110. ISSN 0003-4878. PMC 4522689 . PMID 22156567.  ^ Albert 2011 ^ " Jeremy Rifkin
Jeremy Rifkin
and The Third Industrial Revolution Home Page". The third industrial revolution.com. Retrieved 2016-01-04.  ^ "A third industrial revolution". The Economist. 21 April 2012. Retrieved 2016-01-04.  ^ "Confronting a New 'Era of Duplication'? 3D Printing, Replicating Technology and the Search for Authenticity in George O. Smith's Venus Equilateral Series". Durham University. Retrieved 21 July 2013.  ^ "Materializing information: 3D printing
3D printing
and social change". Retrieved 2014-01-13.  ^ "Additive Manufacturing: A supply chain wide response to economic uncertainty and environmental sustainability" (PDF). Archived from the original (PDF) on 15 January 2014. Retrieved 2014-01-11.  ^ "Materializing information: 3D printing
3D printing
and social change". Retrieved 2014-03-30.  ^ "RepRap Options". Retrieved 2014-03-30.  ^ "3D Printing". Retrieved 2014-03-30.  ^ "Thingiverse". Retrieved 2014-03-30.  ^ a b c d Kostakis, V. (2013): At the Turning Point of the Current Techno-Economic Paradigm: Commons-Based Peer Production, Desktop Manufacturing and the Role of Civil Society in the Perezian Framework.. In: TripleC, 11(1), 173–190. ^ Kostakis, Vasilis; Papachristou, Marios (2014). "Commons-based peer production and digital fabrication: The case of a Rep Rap-based, Lego-built 3D printing-milling machine". Telematics and Informatics. 31 (3): 434–43. doi:10.1016/j.tele.2013.09.006.  ^ Kostakis, Vasilis; Fountouklis, Michail; Drechsler, Wolfgang (2013). "Peer Production and Desktop Manufacturing". Science, Technology, & Human Values. 38 (6): 773–800. doi:10.1177/0162243913493676. JSTOR 43671156.  ^ Campbell, Thomas, Christopher Williams, Olga Ivanova, and Banning Garrett. (2011): Could 3D Printing Change the World? Technologies, Potential, and Implications of Additive Manufacturing Archived 15 August 2013 at the Wayback Machine.. Washington: Atlantic Council of the United States ^ Bradshaw, Simon, Adrian Bowyer, and Patrick Haufe (2010): The Intellectual Property Implications of Low-Cost 3D Printing. In: SCRIPTed 7 ^ Gershenfeld, Neil (2007): FAB: The Coming Revolution on your Desktop: From Personal Computers to Personal Fabrication. Cambridge: Basic Books, p. 13–14 ^ Larry Summers, The Inequality Puzzle, Democracy: A Journal of Ideas, Issue #32, Spring 2014 ^ a b Michael Spence, Labor's Digital Displacement (22 May 2014), Project Syndicate ^ Andre, Helene (29 November 2017). " Naomi Wu
Naomi Wu
– "My visibility allows me to direct more attention to important issues and other deserving women"". Women in 3D Printing. Retrieved 2017-12-03. 

Further reading[edit]

Tran, Jasper (2017). "Reconstructionism, IP and 3D Printing". available on SSRN. SSRN 2842345 .  Tran, Jasper (2016). "Press Clause and 3D Printing". Northwestern Journal of Technology and Intellectual Property. 14: 75–80. SSRN 2614606 .  Tran, Jasper (2016). "3D-Printed Food". Minnesota Journal of Law, Science and Technology. 17: 855–80. SSRN 2710071 .  Tran, Jasper (2015). "To Bioprint or Not to Bioprint". North Carolina Journal of Law and Technology. 17: 123–78. SSRN 2562952 .  Tran, Jasper (2015). "Patenting Bioprinting". Harvard Journal of Law and Technology Digest. SSRN 2603693 .  Tran, Jasper (2015). "The Law and 3D Printing". John Marshall Journal of Information Technology and Privacy Law. 31: 505–20.  Lindenfeld, Eric; et al. (2015). "Strict Liability and 3D-Printed Medical Devices". Yale Journal of Law and Technology. SSRN 2697245 .  Dickel, Sascha; Schrape, Jan-Felix (2016). "Materializing Digital Futures". The Decentralized and Networked Future of Value Creation. Progress in IS. pp. 163–78. doi:10.1007/978-3-319-31686-4_9. ISBN 978-3-319-31684-0.  "Results of Make Magazine's 2015 3D Printer Shootout". docs.google.com. Retrieved 1 June 2015.  "Evaluation Protocol for Make Magazine's 2015 3D Printer Shootout". makezine.com. Retrieved 1 June 2015.  Vincent; Earls, Alan R. (February 2011). "Origins: A 3D Vision Spawns Stratasys, Inc". Today's Machining
World. Oak Forest, Illinois, USA: Screw Machine World Inc. 7 (1): 24–25. Archived from the original on 10 March 2012.  "Heat Beds in 3D Printing – Advantages and Equipment". Boots Industries. Retrieved 7 September 2015.  Albert, Mark (17 January 2011). "Subtractive plus additive equals more than ( - + + = > )". Modern Machine Shop. Cincinnati, Ohio, USA: Gardner Publications Inc. 83 (9): 14.  Stephens, B.; Azimi, P.; El Orch, Z.; Ramos, T. (2013). "Ultrafine particle emissions from desktop 3D printers". Atmospheric Environment. 79: 334–339. Bibcode:2013AtmEn..79..334S. doi:10.1016/j.atmosenv.2013.06.050.  Easton, Thomas A. (November 2008). "The 3D Trainwreck: How 3D Printing Will Shake Up Manufacturing". Analog. 128 (11): 50–63.  Wright, Paul K. (2001). 21st Century Manufacturing. New Jersey: Prentice-Hall Inc. "3D printing: a new industrial revolution - Safety and health at work - EU-OSHA". osha.europa.eu. Retrieved 2017-07-28. Hod., Lipson,. Fabricated : the new world of 3D printing. Kurman, Melba. Indianapolis, Indiana. ISBN 9781118350638. OCLC 806199735. 

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