I wanted somewhere to store my dice, so set about making a giant D20. The photos show four polyhedral sets, but I think there should be room for six without it overflowing.

The CAD file is available at: https://cad.onshape.com/documents/be446cca34d62f0205272d67/w/66718d27632aab9575f7c274/e/464d179fdd995a22d0652d81?configuration=List_Eq0wCvvmJ5yeAH%3DBottom

The numbers are arranged according to the numerically balanced layout used by The Dice Lab. The design also needs six Ø3mm x 2mm magnets that press fit into the holes. The holes may need to be drilled out a little. Make sure you are absolutely certain the magnets are oriented correctly before you press them in, they are impossible to remove if you get it wrong.