Tightened up the tolerances for a better fit (0.1mm for all parts except the face (0.175mm)).
Added a hole for a 3mm³ magnet.
2 versions supplied; one that's double sided (no_base) and one with a printable base (.4mm). I used the one with the base so I could get the printbed texture on both sides.
Slightly bigger than the original and thicker too.
For the keychain print;
For magnet (with base) print;
For magnet (without base) print;