The Answer.

Also, just having fun trying out a some 3D CAD and printing ideas. More versions on the way.

This one : Keychain Fob

You can't tell from the pictures, but both sides are identical.

OnShape 3D CAD files :

https://cad.onshape.com/documents/af42b438f2b265a9a379e2f6/w/22a256a79fa182a723de31ae/e/cf6c89606b1a813e230abf0e

Print instructions

Print in PLA using the 3mf file provided - prints in two colors with filament switching.

Use a smooth plate and clean it with ethyl alcohol (and maybe just a touch of glue) to make sure you get good adhesion on the first layer.