Ok bear with me here.... have you ever wondered how all those slot car prototypes are made? Well maybe they're made with a 3D printer! Watch this video and see how cool this process is. It's made by a company called Z Corp and one can be yours for only $50k USD...and it prints in color too!
I know this is wildly off topic but it's such a cool process I had to post it...thanks to Frank "fgf60" on Slot Car Addicts.