Prusa ColorMix Launches Open-Source Multicolor 3D Printing System

Prusa has released ColorMix, an open-source multicolor 3D printing system under the MIT license. The software integrates directly into PrusaSlicer and EasyPrint workflows to simplify color mixing.

Depth-based layer blending simplifies multicolor printing workflows

ColorMix uses a depth-based approach rather than surface-level dot patterns to create mixed shades. This method stacks differently colored layers so they blend visually through thickness instead of across the print surface.

The current implementation relies on a standard CMYKW filament set, with an expanded CMYKW+ variant in development for better color accuracy. Users must source filaments that match specific shades across different production batches to achieve consistent results.

Prusa provides a built-in color mixing model within its slicer software to predict final output colors. A reasonably accurate monitor is recommended to verify expected tones before printing, though strict calibration is not mandatory.

The system addresses material waste and manual filament switching limitations inherent in single-extruder multicolor setups. By blending colors internally through layer stacking, it reduces the need for frequent tool changes during prints.