D20 dice container
thingiverse
Use 5mm buckyball magnets. The following is the amazon website where I got the magnets. https://www.amazon.com/gp/product/B078MN2FN2/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 I use pliers to snap the magnets into the holes. (worked really well)
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