Show everyone who's in charge with a d20 worthy of a Dungeon Master.
The solid version is a fairly straightforward print, though I recommend supports because there are some horizontal overhangs. The hollow version, on the other hand... well... hope you've got dissolvable supports. Or a whole lot of time and patience. Or you could just grab one from my Shapeways shop at http://shpws.me/KNxH
I really want to try cold-casting the solid version. This thing is begging to be clad in gleaming metal.
How to model a d20