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Look at your computer setup and imagine that you hooked up a 3D printer. Instead of printing on bits of paper this 3D printer makes real, robust, mechanical parts. To give you an idea of how robust, think Lego bricks and you're in the right area. You could make lots of useful stuff, but interestingly you could also make most of the parts to make another 3D printer. That would be a machine that could copy itself.

The Realization

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RepRap was invented by Adrian Bowyer and the idea first appeared online in February 2004.

The word RepRap is short for Replicating Rapid-prototyper. It is the practical self-copying 3D printer introduced in the video on the left - a self-replicating machine. This 3D printer builds the parts up in layers of plastic. This technology existed before RepRap, but the cheapest commercial machine then would have cost you about €30,000. And it wasn't even designed so that it could make itself. So what the RepRap team are doing is to develop and to give away the designs for a much cheaper machine with the novel capability of being able to self-copy (material costs are about €350). That way it's accessible to small communities in the developing world as well as individuals in the developed world. Following the principles of the Free Software Movement we are distributing the RepRap machine at no cost to everyone under an open source license (the GNU General Public License). So, if you have a RepRap machine, you can use it to make another and give that one to a friend...

The RepRap project became widely known after a large press coverage in March 2005.

Machine Self-Replication

Not counting nuts and bolts the latest RepRap can make 70% of its parts; the other parts are designed to be cheaply available everywhere. The primary goal of the RepRap project is to create and to give away a makes-useful-stuff machine that, among other things, allows its owner cheaply and easily to make another such machine for someone else.

To increase that 70%, future versions of RepRap will be able to make their own electric circuitry - a technology we have already proved experimentally - though not their electronic chips. After that we'll look to doing transistors with it, and so on...

Adrian Bowyer (left) and Vik Olliver (right) with a parent RepRap machine, made on a conventional rapid prototyper, and the first complete working child RepRap machine, made by the RepRap on the left. The child machine made its first successful grandchild part at 14:00 hours UTC on 29 May 2008 at Bath University in the UK, a few minutes after it was assembled.

Scholarship and History

Academics and others seeking peer-reviewed journal articles on RepRap may care to start with this paper in Robotica. The citation and link are: Jones, R., Haufe, P., Sells, E., Iravani, P., Olliver, V., Palmer, C., and Bowyer, A.,: RepRap - The Replicating Rapid Prototyper, Robotica (2011) volume 29, pp. 177–191. Cambridge University Press.

If you are interested in the legal aspects of this technology, then you may care to read this paper: Bradshaw, S., Bowyer, A. and Haufe, P.: The Intellectual Property Implications Of Low-Cost 3D Printing, ScriptEd, April 2010 pp.5-31.

If you are interested in how the RepRap can be used to assist in sustainable development see: J. M. Pearce, C.M. Blair, K.J. Laciak, R. Andrews, A. Nosrat, and I. Zelenika-Zovko, 3-D Printing of Open Source Appropriate Technologies for Self-Directed Sustainable Development, Journal of Sustainable Development', 3(4), 17-29, 2010.'

There is also a study on the spread of RepRap and its population: Erik de Bruijn: On the viability of the open source development model for the design of physical objects, November 8th 2010, University of Tilburg, The Netherlands.

For a reasonably up-to-date literature review of RepRap technology see: RepRap Lit Review

To get a copy of the entire RepRap Blog from its very start as a single PDF file download this (41MB). The images in the early bits of the online blog are broken, but they are all in that file.

Spread the Word

You can freely use the RepRap Logo (see the licence terms on the left) and QR code:



  • RepRap - n. any free rapid prototyping machine that can manufacture a significant fraction of its own parts; v.t. (in lower case: to reprap) to make something in a RepRap machine.
  • RepStrap - n. any free rapid prototyping machine that doesn't make its own parts, but is intended to make parts for a RepRap.
  • reprapper - n. a person engaged in making or using RepRaps or RepStraps.
  • reprapable - adj. capable of being made in a RepRap machine.

Also See

Longer Video

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Here is a recent talk and Q&A by Adrian Bowyer about RepRap and self-replicating manufacturing machines.