Filament clips to hold end of filament to prevent unrolling. I got tired of some filament spools which had a very limited number of holds to place the filament end into when not using it, so I made a clip to go on the edge of the spool instead.

In addition to being useful, it's thin enough not to interfere with a filament storage bag, and uses only 55 cm of filament. It's a great use of that last bit of filament at the end of a spool.

I've included two sizes, one for thinner plastic spools, and one for thicker cardboard spools.

Filament:

  Any

Line thickness:

  0.2 - 0.26

Support:

  Mouse ears/brim