I wanted a basic dice tray that had a spot to hold dice but also a space to roll them. I also needed something that would fit on the print bed of my Ender 2 Pro.

Voila: dice tray. Comfortably fits 7-8 standard sized polyhedral RPG dice. There's also a version with a spot for your 28mm mini to stand which will hold approx 6 dice (who needs percentile dice, am I right?)