A blind friend of mine likes to play pen and paper RPGs. He was searching for a D20 with braille numbers since ages. So I modeled and printed one. ;-)...
Revision history
Version 1.5:
celebrating, that this D20 got featured!
sum of opposite numbers is always 21, now
Version 1.4:
rounded edges
Instructions
We found out, that you should resize this thing down to 70% to make it more comfortable to handle. That size still has a good readability for the braille numbers.