Call the nearest asylum just in case, but I have a friend who invented a device a few years ago, and the prototypes were spat out by a machine that was very much like a 3D printer. Quite amazing. I think it used lasers etc.
EDIT: When I say spat out, I should add that it took hours for a small object to emerge from the machine, so it's not quick. It cost a lot of money, too.