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RepRap

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RepRap(a contraction ofreplicating rapid prototyper) is a project to develop low-cost3D printersthat can print most of their own components. Asopen designs,all of the designs produced by the project are released under afree software license,theGNU General Public License.[1]

All of the plastic parts for the machine on the right were produced by the machine on the left. Adrian Bowyer (left) and Vik Olliver (right) are members of the RepRap project.

Due to the ability of these machines to make some of their own parts, authors envisioned the possibility of cheap RepRap units, enabling the manufacture of complex products without the need for extensive industrial infrastructure.[2][3][4]They intended for the RepRap to demonstrateevolutionin this process as well as for it to increase in number exponentially.[5][6]A preliminary study claimed that using RepRaps to print common products results in economic savings.[7]

The RepRap project started inEnglandin 2005 as aUniversity of Bathinitiative, but it is now made up of hundreds of collaborators worldwide.[5]

History

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RepRap 0.1 building an object
First part ever made by a RepRap to make a RepRap, fabricated by the Zaphod prototype, by Vik Olliver (2007-09-13)
A RepRap 10th Birthday celebration

RepRap was founded in 2005 byAdrian Bowyer,a Senior Lecturer inmechanical engineeringat theUniversity of Bathin England. Funding was obtained from theEngineering and Physical Sciences Research Council.

On 13 September 2006, the RepRap 0.2 prototype printed the first part identical to its own, which was then substituted for the original part created by a commercial 3D printer. On 9 February 2008, RepRap 1.0 "Darwin" made at least one instance of over half its rapid-prototyped parts. On 14 April 2008, RepRap made an end-user item: a clamp to hold aniPodto the dashboard of aFord Fiestacar. By September that year, at least 100 copies had been produced in various countries.[8]On 29 May 2008, Darwin achieved self replication by making a complete copy of all its rapid-prototyped parts[9](which represent 48% of all the parts, excluding fasteners). A couple hours later the "child" machine had made its first part: a timing-belt tensioner.

In April 2009, electronic circuit boards were produced automatically with a RepRap, using an automated control system and a swappable head system capable of printing both plastic and conductive solder. On 2 October 2009, the second generation design, called Mendel, printed its first part. Mendel's shape resembles atriangular prismrather than a cube. Mendel was completed in October 2009. On 27 January 2010, theForesight Instituteannounced the "Kartik M. Gada Humanitarian Innovation Prize" for the design and construction of an improved RepRap.[10]

On 31 August 2010, the third generation design was named Huxley. It was a miniature of Mendel, with 30% of the original print volume. Within two years, RepRap andRepStrapbuilding and use were widespread in the technology, gadget and engineering communities.[11]

In 2012, the first successful Delta design, Rostock, had a radically different design. The latest iterations usedOpenBeams,wires (typically Dyneema or Spectra fishing lines) instead of belts, and so forth, which also represented some of the latest trends in RepRaps.[citation needed]

In early January 2016, RepRapPro (short for "RepRap Professional", and one commercial arm of the RepRap project in the UK) announced that it would cease trading on 15 January 2016. The reason given was congestion of the market for low-cost 3D printers and the inability to expand in that market. RepRapPro China continues to operate.[12]

Hardware

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As the project was designed by Bowyer to encourage evolution, many variations have been created.[13][14]As anopen sourceproject, designers are free to make modifications and substitutions, but they must allow any of their potential improvements to be reused by others.

There are many RepRap printer designs including:

Software

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Adrian Bowyer talking about the RepRap Project atPoptech2007

RepRap was conceived as a complete replication system rather than simply a piece of hardware. To this end the system includescomputer-aided design(CAD) in the form of a3D modelingsystem andcomputer-aided manufacturing(CAM) software and drivers that convert RepRap users' designs into a set of instructions to the RepRap to create physical objects.

Initially, two CAM tool chains were developed for RepRap. The first, called "RepRap Host", was written inJavaby lead RepRap developer Adrian Bowyer. The second, "Skeinforge",[15]was written by Enrique Perez. Both are complete systems for translating 3D computer models intoG-code,the machine language that commands the printer.

Later, other programs likeSlic3randCurawere created. Recently, the Franklin firmware was created to allow RepRap printers to be used for other purposes such as milling and fluid handling.[16]

Free and open-source 3-D modeling programs likeBlender,OpenSCAD,andFreeCADare preferred in the RepRap community, but almost any CAD or 3D modeling program can be used with the RepRap, as long as it can produceSTLfiles (Slic3r also supports.objand.amffiles). Thus, content creators make use of any tools they are familiar with, whether they are commercial CAD programs, such asSolidWorksandAutodesk AutoCAD,Autodesk Inventor,Tinkercad,orSketchUpalong with thelibre software.

Replication materials

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A timelapse video of a robot model (logo ofMake magazine) being printed usingFFFon a RepRap Fisher, a delta-style printer.

RepRaps print objects fromABS,Polylactic acid(PLA),Nylon(possibly not all extruders can),HDPE,TPEand similarthermoplastics.

The mechanical properties of RepRap-printed PLA and ABS have been tested and are equivalent to thetensile strengthsof parts made by proprietary printers.[17]

Unlike with most commercial machines, RepRap users are encouraged to experiment with materials and methods, and to publish their results. Methods for printing novel materials (such as ceramics) have been developed this way. In addition, severalRecycleBotshave been designed and fabricated to convert waste plastic, such as shampoo containers and milk jugs, into inexpensive RepRap filament.[18]There is some evidence that using this approach of distributed recycling is better for the environment[19][20][21]and can be useful for creating "fair tradefilament ".[22]

In addition, 3D printing products at the point of consumption has also been shown to be better for the environment.[23]

The RepRap project has identifiedpolyvinyl alcohol(PVA) as a potentially suitable support material to complement its printing process, although massive overhangs can be made by extruding thin layers of the primary printing media as support (these are mechanically removed afterwards).

Printing electronics is a major goal of the RepRap project so that it can print its own circuit boards. Several methods have been proposed:

  • Wood's metalorField's metal:low-melting point metal alloys to incorporate electrical circuits into the part as it is being formed.
  • Silver/carbon-filled polymers: commonly used to repair circuit boards and are being considered for use for electrically conductive traces.[24]
  • Direct extrusion of solder[25]
  • Conductive wires: can be laid into a part from a spool during the printing process

Using aMIGwelder as a print head a RepRapdeltabotstage can be used to print metals likesteel.[26][27]

The RepRap concept can also be applied to a milling machine[28]and tolaser welding.[29]

Construction

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Although the aim of the project is for RepRap to be able to autonomously construct many of its own mechanical components soon using fairly low-level resources, several components such as sensors, stepper motors andmicrocontrollerscannot yet be made using the RepRap's 3D printing technology and so have to be produced independently. The plan is to approach 100% replication over a series of versions. For example, from the onset of the project, the RepRap team has explored a variety of approaches to integrating electrically-conductive media into the product. This would allow inclusion ofconnective wiring,printed circuit boards,and possiblymotorsin RepRapped products. Variations in the nature of the extruded, electrically-conductive media could produce electrical components with different functions from pure conductive traces, similar to the 1940s sprayed-circuit process Electronic Circuit Making Equipment (ECME), byJohn Sargrove.A related approach isprinted electronics.Another non-replicable component is the threaded rods for linear motions. A current research area is in using replicatedSarrus linkagesto replace them.[30]

Project members

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The "Core team" of the project[31]has included:

  • Adrian Bowyer, Former Senior Lecturer, Mechanical Engineering Department,University of Bath
  • Ed Sells, University of Bath PhD "3D Printing: Towards a Self-Replicating Rapid Prototyping Machine"[32]
  • Vik Olliver, the first RepRap volunteer, the first to suggest using PLA as a printing material[33]
  • Michael S. Hart(deceased 2011), creator ofProject Gutenberg,Illinois

Goals

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Video of RepRap printing an object

The stated goal of the RepRap project is to produce a pure self-replicating device not for its own sake, but rather to put in the hands of individuals anywhere on the planet, for a minimal outlay of capital, adesktop manufacturingsystem that would enable the individual to manufacture many of the artifacts used in everyday life.[5]From a theoretical viewpoint, the project aims to prove the hypothesis that "rapid prototypingand direct writing technologies are sufficiently versatile to allow them to be used to make avon Neumann universal constructor".[34]

Education

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RepRap technology has great potential in educational applications, according to some scholars.[35][36][37]RepRaps have already been used for an educational mobile robotics platform.[38]Some authors have claimed that RepRaps offer an unprecedented "revolution" inSTEMeducation.[39]The evidence comes from both the low cost ofrapid prototypingby students, and the fabrication of low-cost high-quality scientific equipment fromopen hardwaredesigns formingopen-source labs.[3][4]

See also

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Notes

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  1. ^"RepRapGPLLicence - RepRap".
  2. ^Pearce, Joshua M.; Morris Blair, Christine; Laciak, Kristen J.; Andrews, Rob; Nosrat, Amir; Zelenika-Zovko, Ivana (2010)."3-D Printing of Open Source Appropriate Technologies for Self-Directed Sustainable Development".Journal of Sustainable Development.3(4).doi:10.5539/jsd.v3n4p17.
  3. ^abPearce, Joshua M (2012). "Building Research Equipment with Free, Open-Source Hardware".Science.337(6100): 1303–1304.Bibcode:2012Sci...337.1303P.doi:10.1126/science.1228183.PMID22984059.S2CID44722829.
  4. ^abJ.M. Pearce,Open-Source Lab: How to Build Your Own Hardware and Reduce Research Costs,Elsevier, 2014.
  5. ^abcJones, R.; Haufe, P.; Sells, E.; Iravani, P.; Olliver, V.; Palmer, C.; Bowyer, A. (2011)."Reprap-- the replicating rapid prototyper".Robotica.29(1): 177–191.doi:10.1017/s026357471000069x.
  6. ^Sells, E., Smith, Z., Bailard, S., Bowyer, A., & Olliver, V. (2009). Reprap: the replicating rapid prototyper: maximizing customizability by breeding the means of production. Handbook of Research in Mass Customization and Personalization.
  7. ^Wittbrodt, B.T.; Glover, A.G.; Laureto, J.; Anzalone, G.C.; Oppliger, D.; Irwin, J.L.; Pearce, J.M. (2013)."Life-cycle economic analysis of distributed manufacturing with open-source 3-D printers"(PDF).Mechatronics.23(6): 713–726.doi:10.1016/j.mechatronics.2013.06.002.S2CID1766321.http://digitalcommons.mtu.edu/cgi/viewcontent.cgi?article=1048&context=materials_fp
  8. ^Matthew Power (23 September 2008)."Mechanical Generation §".Seedmagazine. Archived from the original on 25 September 2008.Retrieved4 June2010.{{cite web}}:CS1 maint: unfit URL (link)
  9. ^Vik Olliver [@VikOlliver] (27 May 2021)."Tomorrow is RepRap Day. On that day in 2008 a 3D printer first achieved self-replication. I may have assisted it slightly"(Tweet) – viaTwitter.
  10. ^"Gada Prizes".humanity+. Archived fromthe originalon 29 July 2012.Retrieved25 April2011.
  11. ^"Ingeniøren".Ingeniøren media. 26 September 2012. Archived fromthe originalon 15 October 2012.Retrieved26 September2012.
  12. ^"RepRap Professional Ltd. is now closed".6 January 2016.
  13. ^RepRap Family Tree
  14. ^Chulilla, J. L. (2011). "The Cambrian Explosion of Popular 3D Printing".International Journal of Interactive Multimedia and Artificial Intelligence.1:4.
  15. ^Skeinforge
  16. ^Wijnen, Bas; Anzalone, Gerald C.; Haselhuhn, Amberlee S.; Sanders, P. G.; Pearce, Joshua M. (2016)."Free and Open-source Control Software for 3-D Motion and Processing".Journal of Open Research Software.4:2.doi:10.5334/jors.78.
  17. ^Tymrak, B.M.; Kreiger, M.; Pearce, J.M. (2014)."Mechanical properties of components fabricated with open-source 3-D printers under realistic environmental conditions".Materials & Design.58:242–246.doi:10.1016/j.matdes.2014.02.038.S2CID15552570.
  18. ^Baechler, Christian; DeVuono, Matthew; Pearce, Joshua M. (2013)."Distributed Recycling of Waste Polymer into RepRap Feedstock".Rapid Prototyping Journal.19(2): 118–125.doi:10.1108/13552541311302978.S2CID15980607.
  19. ^Kreiger, M., Anzalone, G. C., Mulder, M. L., Glover, A., & Pearce, J. M. (2013). Distributed Recycling of Post-Consumer Plastic Waste in Rural Areas. MRS Online Proceedings Library, 1492, mrsf12-1492.open access
  20. ^The importance of the Lyman Extruder, Filamaker, Recyclebot and Filabot to 3D printingArchived2014-03-18 at theWayback Machine– VoxelFab, 2013.
  21. ^M. Kreiger, G. C. Anzalone, M. L. Mulder, A. Glover and J. M Pearce (2013). Distributed Recycling of Post-Consumer Plastic Waste in Rural Areas. MRS Online Proceedings Library, 1492,mrsf12-1492-g04-06doi:10.1557/opl.2013.258.open access
  22. ^Feeley, S. R.; Wijnen, B.; Pearce, J. M. (2014)."Evaluation of Potential Fair Trade Standards for an Ethical 3-D Printing Filament".Journal of Sustainable Development.7(5): 1–12.doi:10.5539/jsd.v7n5p1.
  23. ^Kreiger, Megan; Pearce, Joshua M. (2013). "Environmental Life Cycle Analysis of Distributed Three-Dimensional Printing and Conventional Manufacturing of Polymer Products".ACS Sustainable Chemistry & Engineering.1(12): 1511–1519.doi:10.1021/sc400093k.
  24. ^Simon J. Leigh, Robert J. Bradley, Christopher P. Purssell, Duncan R. Billson, David A. HutchinsA Simple, Low-Cost Conductive Composite Material for 3D Printing of Electronic Sensors
  25. ^RepRap blog 2009visited 2/26/2014
  26. ^An Inexpensive Way to Print Out Metal Parts- The New York Times
  27. ^Anzalone, Gerald C.; Chenlong Zhang; Wijnen, Bas; Sanders, Paul G.; Pearce, Joshua M. (2013)."A Low-Cost Open-Source Metal 3-D Printer".IEEE Access.1:803–810.doi:10.1109/ACCESS.2013.2293018.
  28. ^Kostakis, V., & Papachristou, M. (2013). Commons-based peer production and digital fabrication: The case of a RepRap-based, Lego-built 3D printing-milling machine. Telematics and Informatics.
  29. ^Laureto, John; Dessiatoun, Serguei; Ohadi, Michael; Pearce, Joshua (2016)."Open Source Laser Polymer Welding System: Design and Characterization of Linear Low-Density Polyethylene Multilayer Welds".Machines.4(3): 14.doi:10.3390/machines4030014.
  30. ^"I, replicator".New Scientist.29 May 2010.
  31. ^"The Core Team - who we are"Archived2013-04-06 at theWayback Machine,reprap.org/wiki
  32. ^Petch, Michael (31 May 2018)."Interview: Ed Sells, RepRap 'opened up a multi-billion dollar industry now known as 3D printing'".3D Printing Industry.Archived fromthe originalon 28 July 2020.
  33. ^"Interview: Vik Olliver, the first RepRap volunteer – 'We didn't just build a 3D printer'".29 May 2018. Archived fromthe originalon 21 February 2020.
  34. ^"RepRap—the Replication Rapid Prototyper Project, IdMRC"(PDF).Archived fromthe original(PDF)on 6 April 2012.Retrieved19 February2007.
  35. ^Schelly, Chelsea; Anzalone, Gerald; Wijnen, Bas; Pearce, Joshua M. (2015)."Open-source 3-D printing technologies for education: Bringing additive manufacturing to the classroom".Journal of Visual Languages & Computing.28:226–237.doi:10.1016/j.jvlc.2015.01.004.
  36. ^Grujović, N., Radović, M., Kanjevac, V., Borota, J., Grujović, G., & Divac, D. (2011, September). 3D printing technology in education environment.In 34th International Conference on Production Engineering(pp. 29-30).
  37. ^Mercuri, R., & Meredith, K. (2014, March). An educational venture into 3D Printing. In Integrated STEM Education Conference (ISEC), 2014 IEEE (pp. 1-6). IEEE.
  38. ^Gonzalez-Gomez, J., Valero-Gomez, A., Prieto-Moreno, A., & Abderrahim, M. (2012). A new open source 3d-printable mobile robotic platform for education. InAdvances in autonomous mini robots(pp. 49-62). Springer Berlin Heidelberg.
  39. ^J. Irwin, J.M. Pearce, D. Opplinger, and G. Anzalone.The RepRap 3-D Printer Revolution in STEM Education,121st ASEE Annual Conference and Exposition, Indianapolis, IN.Paper ID #8696 (2014).

References

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