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" was printed using the 3D printer Prusa IT3. The blue color was painted by hand. There's a STEP file available for those who might need it. The font Arial was used for the die.

The die is 3x3x3 centimetres.

This die belongs to the public domain.