Filament clip exclusively designed for prusament spools. I remixed a dedicated clip for my growing number of Prusament.

The universal version: https://www.printables.com/model/136680-filament-clip

To use, thread the filament through the clip, attach the clip to the larger hex holes near the edge, and the tension of the clip will tighten and hold the filament. The clip is holds on spool in a reliable method so it won't come off and frustrate you.

Print settings: 

• Filament: PETG (PLA and ABS cannot withstand the bending pressure)
• Layer height: 0.15mm
• Supports: no
• Perimeters: 2

After printing, cut off support object as shown.