Filament clip for spools.

This filament clip is attached to the holes in the filament spool. It is not meant to hold the filament tightly, just to prevent it from tangling. Put a good length of filament through it to prevent it from slipping back out. The clip can swivel to adapt to the amount of filament left on the spool so the filament won't bend too much and risk breaking. Some spools don't have holes on both sides but a 3mm drill should take care of that.

There are versions for 47mm, 58mm, 62mm and 70mm wide spools.