Cooter was a beaver.** Unfortunately, Cooter died; but thankfully, donated his remains to science and 3D scanning/printing.
I did not find Cooter's lower jaw, so this is the only data I have on him. After a thorough, several-day cleaning, I scanned the skull with a RevoPoint 3D scanner (https://shop.revopoint3d.com). Unfortunately, the scanner couldn't pick up as much detail as I had hoped; but all the main features are there.
I've uploaded the GCODE from PrusaSlicer (https://www.prusa3d.com/page/prusaslicer_424/) I used on my PrusaMini+ in standard PLA. To help combat the loss of features during the scan, I first scaled the STL model to 80% for my GCODE.
My GCODE has supports on the build plate only, which worked well. Any sagging or support artifacts in the undercuts are largely obscured by the fact that it's a rough skull to begin with; so I wouldn't go any heavier on the supports, and you might even be able to get away with less!
** No beavers were harmed in the making of this model.
The author marked this model as their own original creation.