This bumper does not require any adhesive. It simply snaps onto the watch body and stays in place.
I'm not an engineer, so the design may not be perfect, and I can't guarantee maximum protection or durability. However, it works well for me, and I think it looks acceptable.

Printed well even on an ancient Ender 3v2 with standard 0.2mm layer height. It's likely possible to print it better by playing with the settings.