Please watch this video for more info and to see the painting process: https://youtu.be/Vm6paBqxdjU
This is a small thwomp magnet or pin (whatever you decide to glue on the back of it). It can easily be scaled. There are two different model files. One is a flat version where the thwomp's backside is complete flat so you can attach it to things. The other is the full version where it has a normal "thwomp" backside. :)
I printed this on my Robo3D using PLA at 0.3mm layer height. Then I attempted (keyword here) to paint it using normal acrylic paint. Beware of smashed stuff if you print one though. ;)