Prusament PLA ColorMix: Print 45 Color Shades From Just Five Spools

What ColorMix Actually Does

In May, Prusa released ColorMix, an open-source color mixing model built into PrusaSlicer and EasyPrint. The idea borrows from inkjet printing. Just as a CMYK printer lays down tiny dots of four inks to fake every color on the page, ColorMix alternates filament colors layer by layer so the eye blends them at a distance. A 50/50 split of cyan and yellow layers reads as green. No painting, no filament swapping mid-layer, no separate AMS-style feeding tricks beyond what a standard multi-tool machine already does.

The catch at launch was filament. Prusa promised a dedicated bundle, and after a summer of testing, that bundle is here: translucent Prusament PLA in cyan, magenta, yellow, black, and white, plus two glitter spools for shading effects.

Why Translucent Changes Everything

Existing CMYK filament sets on the market are mostly opaque with heavy saturation. They produce bright colors, sure, but tilt the model a few degrees off vertical and a strong striped pattern gives away the trick. The alternating layers never really merge.

Prusa's answer is semi-translucent filament. Light passes through thin layers, so colors stack optically instead of blocking each other. In a 1:1 mix, Prusa says, you genuinely cannot tell it is a ColorMix print even up close. The effect extends to horizontal surfaces too, which is where opaque CMYK bundles fall apart: flat top and bottom layers actually show the mixed color rather than bands of the individual filaments.

The tradeoff took real tuning. Black overpowered mixes quickly, and opaque white turned everything pastel. Prusa iterated on pigment loads until each of the five colors had the right opacity to mix cleanly. Alongside the blending set, they kept the saturated cyan, magenta, and yellow as a separate PLA CMYK line for people who want brightness over smooth transitions.

45 Shades and Glitter Shading

On a four-tool machine using the CMYW palette, ColorMix covers the core spectrum. Add black for the full CMYWK set on an XL+ Five-head or MMU3, and you get 45 distinct shades from five spools. The CORE One+ with the Bondtech INDX upgrade pushes further with three extra tool slots.

Prusa filled those extra slots with something unexpected: ColorMix Gold Glitter and Silver Glitter, both based on PLA Natural so they do not shift color tone. Mixed with the base colors, they add sparkle and a wide range of grayscale shading. The community has already built tools around it, including ColorMix Shading for gradient effects and third-party apps like Gradient Chef for automated coloring.

The Bigger Picture

ColorMix is open source, and the calibration data lives in the OpenPrintTag material database, so any Prusament PLA color can be predicted reliably. Prusa also notes the mixing model works for PETG, PC blend, and TPU, though they admit they are not sure what to use mixed-material prints for yet. That feels honest, and it is the kind of detail that makes this more than a marketing bundle.

If you already run a Prusa multi-tool machine, the ColorMix bundle turns a five-spool investment into a full color library. For everyone else, it is a reminder that the next frontier in FDM color printing is software, not hardware.

Where to Get It

The Prusament PLA ColorMix bundle and the new PLA CMYK set are available now from Prusa's store, with free mixing support in PrusaSlicer and EasyPrint.