I want to see one of these in action!

Imagine, if you will, going to a bookshop and finding that they don't have a copy of the book that you want. Not a problem, however! Let's just call it up on that big machine in the corner, and in a few minutes a brand new, freshly printed, bound copy pops out. You gleefully buy it and take it home. Sound like the replicators on Star Trek? Well, the future is here now! All we need now are the flying cars...