Double Filament Spool

For mounting up to 4 smal amounts of filament on one (Ultimaker) hinge.
I designed this, because the Ultimaker features in the feature dual extrusion.
If you have test materials from different suppliers like me, they alsways send yo a short sample of ~5m. The filament always ravels in my room like crazy, so I decited to invent a thing for this.
You can change the filament on the core to match the combinations you want.
With this thing you can mount four colours on your Ultimaker / Printer.