Backend (backend/app/api/routes/archives.py):
- Added filament_colors extraction from slice_info.config in 3MF files
- Maps filament IDs (1-based) to tool numbers (0-based)
Frontend (frontend/src/components/GcodeViewer.tsx):
1. Multi-color support: Pass extrusionColor as array of CSS color strings for multi-color prints
2. Bambu T-command filtering: Filter out special Bambu commands (T255, T1000, T1001, T65535, T65279) that corrupt tool state
3. Initial tool: Prepend T0 to ensure initial tool is set correctly
4. Disable gradient: Set disableGradient: true for multi-color to preserve actual filament colors (the gradient was turning black into gray/white)
5. Disable topLayerColor: Don't set topLayerColor for multi-color (it overrides per-tool colors)
Key fixes for Bambu G-code compatibility:
- Bambu uses special T commands (T1000, T65535, etc.) that aren't real tool changes
- The gcode-preview library's brightness gradient was modifying colors based on layer index
Commit message suggestion:
Add multi-color filament support to G-code viewer
- Extract filament colors from 3MF slice_info.config
- Pass color array to gcode-preview for tool-based coloring
- Filter Bambu special T commands (T1000, T65535, etc.)
- Disable gradient to preserve actual filament colors
maziggy