Free Multicolor No account needed

Kromacut

Free open-source image to color-layer print tool with auto-paint and 3MF export

Kromacut is a free browser and desktop tool for advanced filament painting without paying. Free and open source. Exports STL and 3MF; no account needed. Last checked 25 September 2026.

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At a glance

Price: Free and open source
Runs on: Browser, Windows, macOS and Linux
Exports: STL, 3MF
Multicolor: Yes
Account: Not needed
Open source: Yes
Skill level: Easy: a few settings to tune
Best for: Advanced filament painting without paying
Selling prints: Allowed Kromacut's terms allow commercial use of your own prints; the rights in the source artwork still apply.
How we checked: Opened the generator Web app opened without an account, with 2D and 3D tabs and image adjustments; GitHub repo is AGPL-3.0
Checked by: Mike Janssen
Last checked: 25 September 2026

Open generator

Sources: Kromacut, Kromacut source code (AGPL-3.0), Kromacut terms (checked 25 September 2026)

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What is Kromacut?

Kromacut is a free, open-source tool for turning 2D images into stacked color-layer prints, the same idea as HueForge. It runs locally in your browser, with desktop builds for Windows, macOS and Linux, and exports either STL or 3MF with the color layers kept.

The project goes further than most free alternatives. An auto-paint mode simulates how light passes through each filament and searches for the best layer stack and filament order for your image. You can calibrate your own filaments by printing a wedge test instead of buying a measuring device, reduce the palette, weight important regions of the image, and step through the print layer by layer before exporting.

Kromacut is licensed under AGPL-3.0 and is under active development on GitHub. It suits tinkerers who want serious filament painting features at no cost and do not mind a tool that is still evolving.