Vacuum forming isn't as sexy as 3-D printing, but it is much more versatile. The process involves heating a thin sheet of plastic and pulling it tight around an object with a vacuum. The waffle iron-like machine can be used to make shells for RC cars, molds for decorative chocolates, and much more. Parts are produced in minutes, the plastic sheeting material it uses is cheap, and it doesn't require any arcane software. Win.