Hang them up! Here's a simple solution a 4 Hook key hanger, wall mount ready for a typical wood or drywall screw. (you could also just slap heavy duty double sided tape on the back and mount anywhere)
For best results print with supports for the hooks, nothing major, auto should work.
Infill: 15%
Filament: PETG (for strength) PLA should also work.
v02: Spread hooks out more, overall size change. Should accommodate multiple key ring sizes now.
The author marked this model as their own original creation.