I'm thinking more ~20 year horizon than next five years. I don't know if 3d printers will advance at the rate that transistors and microchips have, but I expec

I'm thinking more ~20 year horizon than next five years. I don't know if 3d printers will advance at the rate that transistors and microchips have, but I expect in ~20 years they will be able to do some interesting things.