The parts that CAN be 3d printed will never need multiple back-and-forth cycles because 3d printed accuracy is terrible compared to the tolerances required for

The parts that CAN be 3d printed will never need multiple back-and-forth cycles because 3d printed accuracy is terrible compared to the tolerances required for some complex injection moulded parts. In fact using the moulding method your surface finish is accurate literally down the molecular level. (Of course since we're talking about plastic that doesn't mean the overall shape and dimensions are that accurate but that problem is just due to the material properties, not the process) Please note that I am ONLY talking about plastic parts. Every piece of electronics has many injection moulded parts. Show me one item in your house with a 3d printed plastic part? Sorry but you're just wrong about the future of plastic 3d printing machines. There's zero chance it will ever beat a cheap injection moulding machine pumping out 1000s of parts per hour. 3d printing of metal is completely different. That could be a game changer because we do not have good methods to mass produce complex metal parts. 3d printing of plastic is pointless as soon as you need more than 100 parts or so. Also note that your 'sterility' claim is wrong. Injection moulded parts are every bit as sterile as 3d printed parts. PLA can be used for injection moulding too, no problem at all.