You can find my previous iteration of this keychain concept here: https://www.thingiverse.com/thing:3390023

This new iteration is based on several suggestions received in the Commodore Amiga group on Facebook. To make it short, I redesigned it to be much smaller (35x35mm) than the previous and I embedded the keyring loop in the main design to make it (hopefully) sturdier.

Feel free to report any issue you have with it and I will make sure to fix it for you as soon as I have some time for it. :)