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My thoughts on this is that (depending on the sophistication and price of a 2020 or 2030 3D printer) mainstream manufacturing would be challenged in many niche sectors. If a 3D printer for your home can print out lipstick, shoes, a hamburger, a new dog leash, a new tire for your car, a new household robot, etc. then what is going to stop people from investing in a household 3D printer instead of going to Walmart or the mall?I'm not sure I agree with that 3D printing will revolutionize mainstream manufacturing.