MakerBot Thingiverse  is a repository of designs for 3D printable things for use with RepRap 3D printers , humanity’s first general-purpose self-replicating manufacturing machine.
Referenced from: J.M. Pearce, Commentary: Open-source hardware for research and education. Physics Today, November 2013, page 8 .
 Thingiverse http://www.thingiverse.com/
 RepRap http://reprap.org/wiki/RepRap