Combination of a dust filter and a filament clip. Stays on the spool until it's all used up. Hinged construction, snaps closed, prints in place.

Requires a single piece of sponge or similar filtering material. You can get that for example by cutting up a kitchen sponge with a pair of scissors.

Links to other printer accessories I've made:

4 Revo Nozzle Holder for Prusa Mini

Support

All my work is free and in the public domain when possible. If you find it valuable, you can support me on Ko-fi.