Wouldn't it be nice if we could put on a conveyor belt and make metal? Well, if you can do it with nitrogen four, you should be able to do it with metal too!
Well, if we were to make a cold meeting point, and have some lasers meet there, we could make 'liquid metal' and eventually solid metal. This can be done by intersecting lasers into a meeting point where they collect, so we would be making metal from light. The metal will form by cooling the radiation in the laser and then taking the gamma rays and solidifying them. This can be done by using a laser that adds volume of positrons and neutrons to one point, where the metal will be first liquid and then solid, naturally, after a set cooling time.
This will make making things like rails very cheap and easy. This could make sheets of metal for car bodies.