This is a D20 I made for myself a while back when I got into DND. The mesh is a bit rough, but it turned out well for me!
Recommendations:
Export as a high-definition STL, verify a proper scale in your slicer program (at least 1.5"), then finish and paint the print. I had success with a Makerbot; your mileage may vary.
The head is a 20 and the tail is a 1 :)