This is a clip for retaining the battery on a Baofeng UV-5R (and other similar models). Mine broke, so I threw together this one to replace it.

This is the button that you press to release the battery. This is NOT the belt clip.

This is a prototype version which I made by blindly guessing dimensions. I printed it and it ended up working, so I called it good. It's certainly possible that improvements could be made, however.

Also, if you have any improvements, let me know! I'm totally open to modifying the design if you have contributions to provide.