Weak Signal's description 
The RepRap (a short for Replicating Rapid-prototyper) project is working towards creating a cheap and easy-to-use rapid prototype machine that can construct plastic products after downloading a detailed description form a computer. The software will be free under the GNU General Public License. The printer can build any 3D plastic model that one can think of – from flower pots, to vehicle replacement parts . Future programs include expanding to a wide variety of materials: ceramics, wax, metals, etc. One of the project main goals is to design the printer that will be able to self-copy, at a cost of €500 (materials only), so that private people and little communities will be able to use it.