[InclinedPlane]

3D printing isn't magic, it's just a technique. What will be more important is fully automated manufacturing and configurable manufacturing. 3D printing is just the easiest form of such technology. In, say, 50 years you'll be able to upload a design for something to a service and have a factory produce it with little human intervention and very little delay. But it won't be manufactured using solely 3D printing techniques, there'll be "traditional" machining, casting, assembly, soldering, etc. involved, it'll just all be automated.