But that requires there to be 3D printers in place; designed, manufactured and connected to the universe simulator, by whomever it is that created this infrastr

But that requires there to be 3D printers in place; designed, manufactured and connected to the universe simulator, by whomever it is that created this infrastructure, with the intention of allowing "real" objects to be created from within the simulator and provided (in a way) a public API for it. There is also the fact that we can't use 3D printers to create "perfect" or generic objects.