Hello people, here is my solution of a spool for loose filament. I have a few samples of filament (20 m per color). so I wanted this to coil and best 3 next to one another. This spool is fully printable and without screws. And can optionally be used with 3 or 4 arms Longer arms here: http://www.thingiverse.com/make:72957Printparts: Screw both elements a little. Set the arms in the long groove. Now it gets a little tricky. screw both elements together to further the arms to fix. Usually they stick together through friction. If you not trust it, use a dip of Loctite. Hope you got it. Have fun.