I have printed all my interior parts in PETG Carbon, and all have held up fine. One is a mount bracket for the overhang in my F150 for my switch pros switch panel. It has held up to the high internal heat of the cabin and the heat generated from the switch panel itself. During the summer months, you can not hold your hand on the back side of that panel, or it will burn your skin. With both heat sources, the bracket hasn’t warped or deformed at all. You just have to print stuff and see if it works in your setting.
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