Printeer is a kids 3D printer that runs on an iPad and "doesn't require any intermediate steps between design and 3D printing." This is a good idea because 3D printer software is still clunky and finicky.

http://feeds.boingboing.net/~r/boingboing/iBag/~3/EvKeZtySGy4/printeer-a-3d-printer-for-ki.html