Filament Unwinder Clip Keeper (F*U*C*K)..that's what I usually say when my filament unwinds on the floor

thingiverse

Human: Keeps the filament on the spool securely in place to avoid accidental unwinding, which can lead to a tangled mess when the filament gets wrapped under a loop on the spool. This problem often occurs when the filament is not properly secured, causing it to slip out and get entangled. This run-away preventor clip easily attaches to the ANET A8 spool holder, providing a simple solution to this common issue. By keeping the filament tightly in place, you can ensure that your prints are smooth and uninterrupted. On June 14th, 2018, modifications were made to the design by adding small stubs to the sides of the clip keeper. These additions help keep the filament from falling off the clip, ensuring a secure hold at all times.