Compact A1 Mini Compatible Version here: https://makerworld.com/en/models/1289067-student-driver-car-magnet-a1-mini#profileId-1318854

2 color Student driver sign with slight cutout for magnets on the back. I added spots for four magnets, but tested it with only 2 without issues even at freeway speeds. I used 15 mm magnets and attached them with super glue.

I kept tried to keep the print pretty thin to allow for flexibility to adapt to the curvature of the car side and rear panels where I attach it.