This has not been printed. When I print I will update this thing. Here is how I did it :
1 - Downloaded the MBCook squirrel from thingiverse.
2 - Imported the STL file to tinkercad
3 - Added a "hole cylinder" for each hand based on the diameter of a Lego object that fits in the hand, 3 mm.
4 - Added a Lego connector (cylinder) on the back of the head, 5 mm. The idea is to attach hats and/or other stuff.