Summary

Most shopping cards are possible to unlock with "put in - put out" but sometimes the "loading" is sideways, so it needed a coin.

A reusable solution is here: https://www.thingiverse.com/thing:3449904
But I prefer a small solution that only becomes a cap in an emergency, in which case I would then reprint it afterwards.

For best "round" coins it is necessary to print the coin and the mount layer separately but beside. So, I added divided parts separately.
In the .m3f version for PrusaSlicer I also shorted the "bridge"-part on the mount for better breakings.
For best results I recommend importing the 3mf project.

Print Settings

Printer Brand: 

Creality

Printer:                      

Ender 3 Pro

Rafts: 

No

Supports:                      

No

Infill: 

20%