Prusa ColorMix Filaments Let You Print 45 Shades From Five Spools

Prusa has started shipping a new filament bundle built specifically for its ColorMix feature, and it addresses the one problem that made multi-color printing feel like chemistry homework: getting colors that actually blend instead of just sitting on top of each other.

How ColorMix Works

PrusaSlicer and EasyPrint already include a color-mixing model that layers different filaments to create new shades, similar to how an inkjet printer mixes cyan, magenta, yellow, and black dots. In 3D printing, the machine alternates filaments layer by layer. A 50-50 mix of cyan and yellow produces green at normal viewing distance.

The base palette is CMYW: cyan, magenta, yellow, and white. White matters because 3D prints float in air rather than sitting on white paper. Printers with five toolheads, like the Prusa XL+, can add black to reach CMYWK. That five-color combination yields 45 distinct shades.

Why Translucent Filaments Change the Result

Most color-mixing bundles on the market are opaque and heavily saturated. They print bright colors, but the layer-by-layer alternation creates visible striping, especially on sloped or curved surfaces. Prusa spent the summer testing translucent variants. Semi-transparency lets light pass through thin layers, so colors stack optically instead of blocking each other.

The trade-off with translucent filaments is finding the right opacity for black and white. Opaque black overwhelms mixes and turns them muddy. Opaque white pushes everything toward pastels. Prusa adjusted the pigment density until both blended naturally. The result is a set where a 1:1 cyan-yellow mix actually looks green even from a close angle.

What Is in the Box

The core ColorMix bundle contains five 1kg spools: cyan, magenta, yellow, black, and white. Prusa also released a saturated CMYK set for users who want maximum brightness and don't mind some visible layering. The CMYK set uses Prusament PLA Pristine White instead of the translucent white, because that gives better coverage when hiding infill structure through a bright color.

For users who want sparkle, Prusa added gold and silver glitter filaments to the lineup. These work in multi-material jobs alongside the plain ColorMix set.

Who Should Buy It

This bundle makes sense if you already own a multi-material Prusa with at least four toolheads. The MMU3 or a five-head XL+ unlocks the full 45-shade range. A four-toolhead machine can still use the bundle, but you lose black and drop to a narrower palette.

Beginners should start with a simple two-color test before committing to a seven-material project. The automatic filament loading, toolhead calibration, and wipe towers all help, but the first print is still the moment where bad assignments show up.

Prusa's ColorMix approach isn't the only way to do multi-color FFF printing. Snapmaker recently released its own four-filament full spectrum bundle. But Prusa's translucent formulation does solve the striping problem better than most off-the-shelf options, and the software integration with PrusaSlicer is already in place.