Clay (and Frosting!)
MakerBot's desktop 3-D printer, sold as a build-it-yourself kit, already created plastic objects at home. Now it can add a new printhead, the Frostruder MK2, that squeezes out any pasty medium: clay, silicon, epoxy -- even cake icing. The tool is actually a 60cc syringe that gets its pressure from an air compressor instead of a plunger. It can precisely control a stream down to 0.02 inch thin because a relief valve dumps excess pressure, avoiding the oozing of earlier plunger designs.