The famous RED KEYCARD from the game Escape from Tarkov, now in keychain format!
 

The model has a customizable label so you can use it to tag your keys, for example how I did with the tag “home".

To edit the text, it's as simple as opening the 3mf and editing the “CustomText” object and you can freely change the content and position/scale.

For this print, you need to have AMS or other multi-color system.
I would recommend a layer height of 0.08 mm or less.

The keychan size is 28.5 x 18 x 0.8 mm.