It makes piston ships and it doesn't use limited supplies. The ships are similar to cracker64's, but mine do not use cray in the actual ship. Instead, a sideways piston retracts the piece that the cray erases in cracker64's. Because the parts are all printable, the ship is printable and voila you have a piston ship factory with unlimited ammo. There is even a spark limiter on the "make" button so you don't have to be super careful with sparking only once.