A die for teachers En betygstärning för lärare

A friend of mine is a teacher and he jokingly came up with the idea for a die (remember that dice is plural) to help him set grades. I found an ordinary die by Shiera here http://www.thingiverse.com/thing:27921 (thank you) and then I hired http://www.fiverr.com/hoangvantan124 (thank you) to modify it and change to the letters A-F instead of the figures 1-6. The first file had some MESH errors so he corrected that and created two different versions of the STL file. The file "die version 1.stl" wa