My coworker requested I make one of these for him after he accidentally opened all of the windows to his car on a rainy day.
If you put the key on a ring, don't print part2, but if you just carry the key around, part2 will keep the cover in place. Make sure the cover prints in the current orientation and part2 prints laying down for strength. No supports needed, print at 100% infill.
If you need this printed, let me know! I'll send it to you for $8 + shipping