Magnetic Pen Holder
thingiverse
Simple pen holder with slots for coin shaped magnets. Holds pens, pencils, dry-erase markers, etc. Designed to use two of these magnets: https://www.amazon.com/gp/product/B075WV5HPH/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 When oriented the right way, the magnets will hold themselves in the slots, but a little glue or putty could be used to secure them better.
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