here is a mini figure style key holder I designed on tinker cad.
Included are 2 stl files one for screw mounting the other can be used with double sided tape.
You can use this minifigure for other things to not just keys :)

you can even add magnets to the hands.

I used cura to print this. 20% infill with 2 walls and tree support. print file as is no need to rescale.

if you want to share this design please give credit to me by sharing the thingiverse link.

Creality

Ender 3

No

Yes

200

20