3DQF 1.75mm Filament Clip

Simple friction fit filament clip for [3DQF](https://www.3dqf.co.uk/) cardboard spools (and probably other cardboard spools), holds 1.75mm filament tightly and has a low profile on outside of spool to allow stacking spools without worrying your filament will unravel! It is is designed to be left on the spool even during use and shouldn't snag the filament as it feeds.

EDIT: v2 added with slightly better grip of cardboard and filament.