Dice box and tray with round magnet holes
thingiverse
Remix to enlarge square magnet holes to 6mm diameter by 3mm deep round magnet holes. The actual hole size in the model is 6.4mm x 3.05mm, which fits perfectly for 6mm x 3mm magnets when printed. If you need a different magnet hole size, modify these Tinkercad designs: https://www.tinkercad.com/things/93gkjaDY2Q9 (base) https://www.tinkercad.com/things/iv4kz9p5Vzm (top) https://www.tinkercad.com/things/6QfWOCmyCwC (top with clipped corners) Additionally, I've created a lid version with clipped corners on 4 of the magnet bosses.
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