A detailed,(sort of)realistic-looking human skull.
This is the first version of it and has some really thin areas on the nose and temporal bones, but prints fine as long as you keep the supplied(or bigger) size.
Edit: Fixed to thin areas so now it should print without a hitch.
Use "supports everywhere" on this one, in my experience supports detach rather easily and cleanly.
The author hasn't provided the model origin yet.