Quick release spool holder
thingiverse
Spring loaded filament holder, push the spool to compress the spring, pull the slotted flange off, slide the spool off. Saves having to unscrew nuts to remove the spool. Requires a nut either side of the static bearing (bearing inside the slotted flange) and a lock nut on the spring side (pictured with 2 nuts locked together because I don't have any nyloc nuts)
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