Spool Holder - keeper nuts
thingiverse
If you are using a threaded rod (3/8 inch) as a spool holder these keeper nuts will thread onto the rod and hold the spool bobbins (such as thing 316826) in place. rev_A - too tight, hole closed slightly when printed. rev_B - fixes the hole size to account for shrink rev_C - removes the sharp points that hurt my fingers
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