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AutoForge

Open-source optimizer that picks filament colors and swap layers for a HueForge-style picture print

AutoForge is a free browser and desktop tool for automatic color plans for filament paintings. Free. The software is CC BY-NC-SA 4.0; prints you make are covered by the MIT license. Exports STL and PNG; no account needed. Last checked 28 September 2026.

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At a glance

Price: Free. The software is CC BY-NC-SA 4.0; prints you make are covered by the MIT license.
Runs on: Browser, Windows, macOS and Linux
Exports: STL, PNG
Multicolor: Yes
Account: Not needed
Open source: No
Skill level: Some learning curve
Best for: Automatic color plans for filament paintings
Selling prints: Allowed The README says the prints you create fall under the MIT license and you can do whatever you like with them; the software itself is non-commercial (CC BY-NC-SA 4.0).
How we checked: Read the tool page and docs GitHub README read: STL, swap instructions, preview PNG and .hfp output; defaults 0.04 mm layers, 75 layers; Hugging Face Space linked. The Space itself was not reachable from our check environment.
Last checked: 28 September 2026

Open generator

Sources: AutoForge README and license (GitHub) (checked 28 September 2026)

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What is AutoForge?

AutoForge turns an image into a layered filament painting and works out the color plan for you. Instead of placing each color change by hand, as you would in HueForge, it runs an optimization that chooses which filament goes on which layer and then writes out the model and the swap list.

You give it a picture and your filament library, either a CSV exported from HueForge or a JSON file with each filament's color and transmission distance (TD). It returns an STL, a preview image of the final colors, swap instructions and a HueForge project file (.hfp) you can open to fine tune the result. A FlatForge mode makes one STL per color for face-down printing. Default settings use 0.04 mm layers and up to 75 layers.

There is a free browser version on Hugging Face Spaces, a pip package for the command line and a one-click web UI installer for Windows, macOS and Linux. It runs faster with a CUDA, ROCm or Apple GPU. It suits filament painters who want a good starting color plan without hours of manual tweaking.