This is a hollow D20 you can print in place and when it's done, hang up from the top (there's a 3mm hole) and fill with small things, like candy or regular sized dice.
I tried to print it a few ways and ultimately rotated it so one number was on the bottom and added a large brim. It was perfect. So weird. I didn't use supports, islands, anything. Those had resulted in about 6 fails.
Huge_Christmas_D20_v2.stl | 379.6KB |