Car cigarette lighter socket cover
thingiverse
The phone end of a standard Lightning or MicroUSB / Type-C cable can easily short the contacts inside the 12V cigar lighter outlets causing huge sparks and damage - I know it from experience. Our car came with only the cigar lighter and no dummy plug to cover it so I designed one I like. There are two versions: one standard and one with a small hole added for fixing if you are afraid of losing it. Also, I added a lightning icon as decoration and marking. Credits for this go to fjstudio (https://www.flaticon.com/authors/fjstudio), I found the vector graphics file on flaticon.com. Tried it and found no rattle, however be careful with the ears as they may be a bit fragile (see print notes!).
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