Ensure your filament doesn't get tangled. This clip helps store your filament safely. The filament clip is available in 1.75mm (~2mm) or 3.00mm (~3.3mm) versions. The clip has holes on each side to support a wide variety of spools. This works with 5lb 38mm, 1Kg (2.2lb) 50mm, and 1lb 38mm spools.