Ok new back piece has been printed, and is working well once reassembled. I also too the extra time to use heat set inserts instead of nuts to simplify assembly/disassembly...motor and electronics working well, its actually a little quieter than it was before. Now I'm in a holding pattern until the car comes home, hopefully in 2 weeks.
I think I'm going to hold off on printing a new radio bracket until my new printer arrives. It will print much faster and cleaner, and with water soluble supports, so I don't have to worry about quality and warping. That new printer likely won't arrive for at least a couple of months as it is new to market. Incidentally this will be the printer that I start using when I work on the 3d printed tail lights, and eventually the center console, dashboard, and potentially armrests and other things I would want to improve on.
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