This is a fixed version of the Makerbot Skull which can be found at https://www.thingiverse.com/thing:308335
The original file would not work in openscad so Britt Scott fixed the stl file.
Then I added a plug to remove the hole used in the original stand
I also increased the original size by 20% so its roughly as big as you can go on a prusa mini.
And added a thread M12 x 1.75 6H
The author hasn't provided the model origin yet.