The Hy-Rel 3D is a 3D printer with four extruder heads that prints with play-doh, Sugru, plasticine, and other pasty substances. Here's a demo of the printer running four different colors of Sugru -- a great, fast-drying, dishwasher safe fix-everything putty -- to print out a (fairly low-rez) semi-sphere. The Hy-Rel was funded through a successful Kickstarter, and now sports "emulsifying extruders" that are the basis for this demo.

3D printing sugru for the first time!