Reducing filament waste and print time is an admirable goal, and if you make your own extruder, you can turn all of that purge waste into various shades of greenish brownish filament.

[Stefan]’s first batch of recycled filament came from purge poops that had been sitting around a while, and sucked a lot of water vapor from the air. A treatment in a heated vacuum chamber seems ...

Changing a colour mid-print usually requires the printer to complete a purge block to make the smooth colour transition. These take ages and waste heaps of 3D filament, especially if there's a big ...