While we're monkeying with our MakerBots, large corporations have much better toys to play with. They insist on calling them "additive manufacturing" machines but, truth be told, they're just Replicators with a superiority complex. They sinter or melt powdered or solid metals using lasers or electron beams, then deposit them in layers to form objects. Companies were previously leaning on such (incredibly expensive) devices for rapidly building prototypes like the Audi concept car shown above. Though that's still a huge part of the industrial 3D printer business, the machines are now churning out finished products as well.