What does Prusa's new ColorMix filament bundle actually let you print?

Halftoning comes to the layer stack

Inkjet logic turned sideways. The slicer alternates filaments layer by layer instead of laying dots on paper. A 50 percent cyan layer followed by a 50 percent yellow layer reads as green from a normal viewing distance. The base palette is CMYW — cyan, magenta, yellow, white. White is required because the printer deposits plastic in air, not on a white substrate. Black can be mixed from equal parts cyan, magenta, and yellow, but the result is a blueish grey. Adding a dedicated black filament shifts the palette to CMYWK and unlocks 45 shades on a five-toolhead machine such as the Prusa XL+ Five-head or an MMU3-equipped printer. The CORE family with the Bondtech INDX upgrade adds three extra tool positions, raising the theoretical maximum to eight filaments.

Translucency solves the stripe problem

Most CMYW(K) bundles on the market are opaque and saturated. On vertical walls they look bright, but any surface tilted away from vertical shows a strong stripy pattern from the alternating layers. Prusa tested the available translucent options and found they blended cyan, magenta, and yellow much more smoothly. The difficulty was white and black. Opaque white turns mixes pastel. Opaque black overpowers every combination because ColorMix results already trend dark. The new PLA ColorMix filaments are semi-translucent. Light passes through thin layers so colors stack optically instead of blocking each other. At the same time, thicker sections block light normally. On a test model with faces printed parallel, perpendicular, and at 45 degrees to the bed, color variation between orientations is minimal. Flat top and bottom layers look like the mixed color, not like stripes. Vase mode prints show the translucency clearly. A spiral vase rose demonstrates how light moves through the walls. The ColorMix Black sits beside Prusament PLA Jet Black in comparison photos — different opacity, different mixing behavior. This optical stacking is the core breakthrough: it lets the same G-code produce consistent hue across curved, angled, and flat surfaces without per-angle compensation.

Two bundles, two price tiers

The translucent PLA ColorMix line launches in five base colors — Cyan, Magenta, Yellow, White, Black — plus Gold Glitter and Silver Glitter. One kilogram costs 32.99 USD or 32.99 EUR including VAT.

Glitter adds grayscale and galaxy effects

Gold Glitter and Silver Glitter are based on PLA Natural, so they do not shift hue. Mixed 1:1 with any dark PLA — Blood Red, Emerald Green — they produce a sparkling galaxy look without dulling the base color. Royal Blue and Anthracite Grey work equally well. Combined with the ColorMix black and white, the two glitters yield about 20 distinct grayscale shades. That range makes black-and-white photos, architecture models, and animals such as a tabby cat look more realistic. The glitters also work with PLA Woodfill; a spiral plant pot printed in Pastel Brown mixed with Gold Glitter shows subtle contrast shifts between surfaces printed at different ratios. Supports printed in pure glitter become part of the aesthetic. A cute stylized dinosaur toy uses Emerald Green, Lipstick Red, and Royal Blue as base filaments with 1:1 glitter mixing throughout. The seven-spool ColorMix bundle sells for 209.99 USD or 180.49 EUR including VAT. For four-toolhead printers Prusa also offers the PLA CMYK bundle: opaque Cyan, Magenta, Yellow, and Pristine White. That four-spool set costs 143.99 USD or 123.99 EUR including VAT. The CMYK white is too saturated for the translucent mixing workflow. Prusa recommends ColorMix Black if a fifth slot is available. Both bundles are available now.

Rules for reliable results

Layer height must not exceed 0.15 mm. Prusa says 0.1 mm is even better but adds significant print time and is usually unnecessary. Infill should be gyroid at 5–10 percent density; the uniform structure stays invisible through the semi-translucent walls. Vertical surfaces give the best color fidelity. To make models shareable, Prusa proposes a fixed filament loading order: Cyan, Magenta, Yellow, White, Black, Gold, Silver. The order stays the same whether the printer has four, five, or eight tools. The preset can be saved in PrusaSlicer.

Beyond the launch bundles

Software calibration relies on actual prints stored in the OpenPrintTag Material Database, so any Prusament PLA colors can be mixed with predictable results. New web tools such as the ColorMix Image Mapper, Color Mix Lab, and Gradient Chef automate color assignment on models. Mixing four colors at once produces muddy brown, so the system sticks to pairwise blends. Prusa has also tested PETG, PC Blend, and TPU — the mixing works mechanically, but the company has not yet identified a clear use case for multi-material color mixing. The Nefertiti bust colored via Color Mix Lab shows automated mapping. A sci-fi vase and low-poly bunny from PrusaSlicer's Shape Gallery demonstrate Gradient Chef. Prusa encourages designers to share ColorMix creations on Printables.com with the "colormix" tag.