JJ showed me this the other day - I want one - we should get one- in fact everybody needs one, imho....RepRap is short for Replicating Rapid-prototyper. It is the practical self-copying 3D printer shown on the left - a self-replicating machine. RepRap will make plastic, ceramic, or metal parts, and is itself made from plastic parts, so it will be able to make copies of itself. It is a three-axis robot that moves several material extruders. These extruders produce fine filaments of their working material with a paste-like consistency. Conductors can be intermixed with the plastic to form electronic circuits - in 3D even!