This is a printable case for the AirPods 4. It should stay on without any need for glue or double sided tape and features cutouts for the charge port and the indicator light. For the ANC version, I've also added openings for the bottom speakers. Through the case, the AirPods are still wirelessly chargeable.

I've added a version with a loop, so you can attach a carry band or carabiner if you want to.

Printing

I've printed them upside down because I wanted the round edges to be as smooth as possible. That requries minor supports but they are very easy to remove. You'll need to enable “don't support bridges” in OrcaSlicer in order for that to work.