I am very happy with a brand of filament that happens to have spools that don't fit my 3D printer (here: https://www.youmagine.com/designs/reprap-leeuwenhoek-v1)now I can buy this cheaper material and respool my empty colorfabb spools easily. This design works well with many other, but not all spools.As always, feel free to modify the idea to fit your needs
I'm an architecture student at the TU Delft. 3D printing has been a hobby since january 2013, since then I have helped out with several projects.My current focus is the RepRap Leeuwenhoek, which I developed to fit my needs (fits in a locker, ...