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I work in R&D and my company has 2 large printers. We mainly use ABS and Polycarbonate materials. PC is stronger than ABS. We can print large parts. We use parts mostly to test fit parts and do some light function testing before final plastic injection tooling is released for production. FDM materials are not strong yet to replace actual plastic. Also it's not cheap to print large parts especially when they are tall. Part finish is very rough. I would only use these parts where they are not exposed to any type of stress.
I designed very nice custom cup holders that fit in the door pockets for driver and passenger. Had to do lot of sanding to get parts to look smooth so they can be painted.
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