Right now, 3D printers are best for making prototypes. You can make small objects with them, but they are built in layers, unless you have access to some of that ZCorp "scree" technology. Same basic idea, however. I still think they have a good future in duplicating small parts you can't get.
But the real game changer is going to be cheap SLS machines. These can print metal and that will make all the difference.
But the real game changer is going to be cheap SLS machines. These can print metal and that will make all the difference.