3MF Compare Tool

A free, browser-based tool to compare two .3mf files and see exactly which slicer settings differ — instantly, with no uploads.

Built for BambuStudio and OrcaSlicer, but also works with other PrusaSlicer-based slicers (Elegoo, Orca forks, etc.).

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Try it now: https://trusteeoil.github.io/3MFCompare/

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Features

• Compare two .3mf files side by side
• Highlight only the settings that actually differ
• View full settings or differences only
• Search and filter settings instantly
• Copy differences as a clean Markdown table (perfect for forums/Reddit)
• Dedicated views for:
  • All settings differences
  • Printer & profile summary
  • Filament settings
• Color preview for filament colors
• Handles slicer quirks (arrays, duplicated values, etc.)
• No install required — runs directly in your browser

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Privacy

• 100% local processing — your files never leave your device
• No uploads, no tracking, no data collection
• Uses JSZip (via CDN with integrity check) to read .3mf files safely

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How It Works

A .3mf file is essentially a ZIP archive.

Inside each file:

• Metadata/project_settings.config contains all slicer settings (JSON)

This tool:

1. Opens both .3mf files locally
2. Extracts the settings JSON
3. Normalizes values to avoid false differences
4. Displays only what actually changed

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Usage

1. Open the tool in your browser
2. Drop in:
   • File A
   • File B
3. Click Compare Files
4. Explore:
   • Settings Differences
   • Printer & Profile
   • Filaments
5. (Optional) Copy results as Markdown

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Example Output

| Setting | File A | File B |
|:---|:---|:---|
| layer_height | 0.2 | 0.16 |
| infill_density | 15 | 25 |

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Why This Exists

Slicers don’t provide a real "diff" view.

When troubleshooting prints or sharing profiles, it’s hard to know:

• What actually changed
• What caused a print issue
• What someone else did differently

This tool solves that.

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Supported Slicers

• BambuStudio
• OrcaSlicer
• PrusaSlicer-based slicers (partial support depending on keys)

Note: Some slicers may use different setting names.

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Limitations

• Requires project_settings.config to exist in the .3mf
• Differences depend on how slicers store values internally
• Some advanced/custom keys may not appear in grouped views

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Tech Stack

• Vanilla JavaScript (no framework)
• JSZip (for reading .3mf files)
• Fully client-side

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Contributing

Feel free to:

• Open issues
• Suggest features
• Submit improvements

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License

MIT license.