1.75mm filament colorizer

thingiverse

This user tried a different colorizer but faced inconsistent results due to potentially sub-optimal filament size. They then designed this 1.75mm filament-fitting colorizer, which prints in under 20 minutes and requires minimal plastic. While it works, improvements include more secure attachment to the extruder head (possibly via Mk7 adjustments), stackable units, and stronger marker retention. It was printed with a Thing-O-Matic/Mk7 at 20% fill, no extra shells, .32 layer height, and 35mm/s feedrate. To use it, thread filament through the colorizer before the extruder head, and insert markers post-heating and just before printing to prevent weakening the plastic.