Simple 4pz puzzle in the shape of a cat.

I found some similar models but was not satisfied with the tolerances. This one should hold together while still being easy enough to assemble by a child (tested on a 1.5 year old :) )

Test print is with Elegoo PLA+.

Can be scaled down or up to fit your needs. Tolerances have been tested down to 50% scale but the fit becomes quite tight.