A D&D Dice Set for Painting
These dice have outset numbering and edges, with the rest of the face inset. This means that up to three colors can be applied to the dice once printed.
Dice set consists of a d20, d12, d10, d00, d8, d6, and d4.
Painting example: For the purple/gold/black dice I first sanded the dice to a finish such that they registered as fair when I roll-tested them (I used a χ2 test). Next, I mixed purple acrylic paint with varnish and pushed the mixture into the depressed areas. Once dry, I re-sanded the dice so that the purple paint remained only in the depressed areas. Then I colored the edges using a sharpie. Finally, I painted the numbers with a small brush and gold paint mixed with varnish.
It is possible to (slightly) bias the dice during sanding by sanding the face opposite to the biased face broader than the rest. I found the best way to ensure fair dice is to see-saw between sanding the largest and smallest numbers. (e.g., 1, 20; 2, 19; etc.)
I put a reasonable amount of thought into the dice numbering. For the d20, I used an ideal numerically balanced numbering system described in this paper:
Platonic solids came from Dan Hienzsch via https://hackaday.io/project/161211-parametric-platonic-solids-from-fusion-360
Pentagonal trapezohedron (d10, d%) was modified to be fully solid and came from Zdolshin via https://www.thingiverse.com/thing:3321836