It really opens up a new world. 3D printers offer two new great possibilities. First, you can design an object from inside while traditionally it has always been designed from outside. If I shape something from the outside, then how can I go inside? I could glue pieces together, an awful choice when crafting jewels. And then with a 3D printer you can create extraordinary and very elaborate insides, this depends on the fact that you proceed by adding layer upon layer. For instance, an exact copy of our planet – with everything in it: white sea breams, microwave ovens – would be impossible to make, but if we had a big enough printer it could be done. A problem could arise though: could 3D printer use get out of hand? As with all great inventions, beautiful and useful, th...