Ink Injector for 3mm Filament

thingiverse

To color Natural PLA, place a 3mm filament near the extruder and attach two spool holders. Cut a sponge and apply ink drops from an inkjet printer onto it (use gloves). Place the inner top over the top, followed by the outer top with clips. Consider using kitchen dye as well. For further improvement, think about incorporating a color inkjet head to spray color directly onto the filament before extrusion.