D20 dice container
thingiverse
I highly recommend utilizing 5mm buckyball magnets for a multitude of purposes. I personally acquired these exceptional magnets from Amazon, and you can find them at https://www.amazon.com/gp/product/B078MN2FN2/ref=oh_aui_search_detailpage?ie=UTF8&psc=1. To activate the magnetic properties, simply use pliers to snap the magnets into place, a process that worked remarkably well for me.
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