Refridgerator Pen Holder with Hidden/Embedded Magnets
thingiverse
A magnetic pen holder for use on a refrigerator, metal filing cabinet, etc. Has room for 3 cylindrical magnets, sized up to 10mm diameter and 1.75mm tall. Print the first ~3.5mm then pause the print (using GCode to pause for a filament swap or any other pause-at-height technique that works for you), drop in the 3 magnets, then resume the print to fully encase the magnets within the holder--no glue required and no risk of magnets falling off.
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