# Spectrum Forge — free browser tool for U1 multicolor / HueForge-style prints via Orca Slicer **URL:** \ **Category:** U1 Toolchanger\ **Created:** [May 16, 2026, 1:58am UTC](https://forum.snapmaker.com/t/spectrum-forge-free-browser-tool-for-u1-multicolor-hueforge-style-prints-via-orca-slicer/41992 "2026-05-16T01:58:16Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![L\_Gillis](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.snapmaker.com/l_gillis/32/32835_2.png) [@L\_Gillis](https://forum.snapmaker.com/u/L_Gillis)\ **Post date:** [May 16, 2026, 1:58am UTC](https://forum.snapmaker.com/t/spectrum-forge-free-browser-tool-for-u1-multicolor-hueforge-style-prints-via-orca-slicer/41992/1 "2026-05-16T01:58:17Z")
Been trying to do HueForge-style multicolor prints on the U1 and hit the same wall everyone does — HueForge exports STLs with height-based color changes, but the U1 is a toolchanger. It doesn’t do filament swaps by layer height, it does per-tool color assignment. The file formats just don’t talk to each other. Built a browser tool to bridge the gap. **Spectrum Forge** takes any image, maps it to your filament colors, and exports a watertight 3MF with per-pixel `paint_color` encoding that Orca Slicer actually understands. It also allows adjusting the aspect ratio in the page. Two modes: - **Toolchanger Painted** — assigns tool slots per color region. Built for the U1. - - **Traditional Height** — classic layer-swap for single-extruder setups. - No install. Runs in the browser. Pick your filaments, drop an image, export 3MF, open in Orca. First 100 downloads free: [inkwell.wiki/tools/](https://inkwell.wiki/tools/chroma-forge)spectrum-forge Works with any toolchanger running Orca Slicer (Prusa XL, E3D, etc.) but I built it specifically because the U1 had no working path to multicolor prints from images. Happy to answer questions about the 3MF structure or print settings. Also built a companion tool called **Flat Forge** for face-down postcard prints if anyone’s into that.