These shells hold the original tiles together with magnets.
Each shell requires twelve 3mm cubic magnets, for a total of 228 (19 hexes * 12 magnets) to complete the original game set.
If you also want to print the port shells, note that an extra 18 magnets will be needed (9 ports * 2).
I can't seem to find 3mm Cubic Magnets on Amazon anymore, so here are some possible other places to look. I'm not endorsing any of these, so make sure to research them:
Lightinthebox
eBay
NewEgg Search
NewEgg
NewEgg
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Hex_Shell_Cube_Magnets.stl | 13.0KB |