HID iClass Key Fob Case

My apartment uses this key to open the front door, lift, etc.
However, the part that forms the ring to hang on a keyring broke.

This is my first attempt at modelling something but I was able to use TinkerCAD to create a case for the key so I could hang in on my keyring agin.

This does require that the key itself be filed down a little to fit (not a problem when it's already broken in that place). The two parts also just stick together by friction, it requires a bit of force to stick them