I have designed this key holder that recreates some rock cracks so the keys are held usind a climbing nut keychain.
If you want you can use a real nut, but I added a 3D printable one.
I have mounted the one on the image using double sided tape, there is a verison with holes so you can use screws.
The nuts I have designed uses 2mm cordino.
Print Settings
Printer brand: Anycubic
Printer: Mega Zero
Rafts: No
Supports: No
Resolution: 0.3mm
Infill: 20%
Filament brand: ELGOO
Filament color: Grey
Filament material: PLA
Credits:
Arnallo