Filament Holder

My filament comes "loose" and not on a reel, so I designed this holder to hold it for printing. The "prongs" are from the design "yet another reel holder" by GMFerrari. The centre hub is designed to loose fit over 22mm plastic water tubing from DIY store (see picture). The prongs are a tight push fit into the centre hub (may need some filing to fit). Sketch files provided if you wish to modify.