this is a small bub (bubblun) or bob (bobblun) keychain which can be printed in colored layers.
bub is green and bob is blue. i've mirrored bub in prusaslicer.
i created each layer as polygons in openscad and then stacked them in prusaslicer. the 3mf file is attached if you want to change anything.
The author hasn't provided the model origin yet.