Model 3 J1772 Adapter Holder Trunk
I whipped this up after years of just tossing the adapter in the little pocket. The adapter fits well with little resistance.
It holds the 1772 adapter to the liner using the slits in the trunk on the left side of my 2018 Tesla Model 3. It'll probably fit other years and maybe other makes.
The slit I designed this for is about 8 mm tall and about 6 cm wide;
I printed using PETG, 0.2mm layer height, 20% infill, 0.4mm nozzle, and 3x wall count. Any semi flexible filament will probably do because it relies a little on friction on the middle part of the adapter and deformation to keep it from easily sliding out.
I printed this upside-down without any supports at 60 mm/s.