Decided to make my nephew (a gamer) a 21 sided die / dice for his 21st birthday.
Trouble is, there isn't really such a thing, so after some investigation, I realised I had to conceptualize/design/test/print the thing myself.
Of course having an odd number of sides, it lands edge-up. So to know which side of the edge is the result, I placed a ridge along the top of each side. The side of the faceup ridge with the line on it is the rolled result.
Probably rolls close to fair if you give it a proper roll. Needs full testing to be sure.
Printed at 100% infill to make sure the weight is right. No support needed.
Perfect for a "not quite +1" sword.
"This sword rolls up to a 21."
"Why not just give it +1 on a d20?"
(pause) "But - This one goes up to 21. It's one hittier."