3mm Filament Clip, ESUN Spool
thingiverse
This version will fit snug on the spool without protruding too deeply on the inside and interfere with the wound filament. It will hold the 3mm just enough to make it easy to connect and disconnect. The file contains only one clip, so include a few before you slice. I tried a few that were similar but they either didn't fit the spool, didn't fit 3mm filament, or the walls were too thin and broke when I tried to either clip it on the spool or clip the filament in. Instructions 100% infill
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