Here you will find the main resources for the StrongHold One, including the CAD model, Bill of Materials, and printed parts files.
CAD models for all StrongHold One variants are available through the Rat Rig Fusion 360 online viewer.
StrongHold One - 750x750
StrongHold One - 750x1250
StrongHold One - 1250x1250
- Open the web viewer for your variant to inspect the full assembly directly in your browser.
- Inside the viewer, you can download the complete model or individual components as needed using the download button in the top right corner.

- The CAD models can be used as a reference when building, servicing, or customizing your machine.
Official BOM StrongHold One
- The official BOM spreadsheet is available for all Rat Rig Mill variants.
- Please be aware that the machine size affects the lengths of some components such as extrusions, linear rails, lead screws and wiring.
- The hardware packs are universal for all sizes.
StrongHold One Printed Parts Pack
Individual STLs available on GitHub
- All files are provided in the correct orientation for printing on a standard FDM 3D printer.
- In general, the printed parts are quite forgiving but are also quite large.
- If you suffer from drafts and/or poor bed adhesion you may need to use brims/rafts for some parts to prevent warping.
- Perimeters: 4
- Line Width: 0.45 mm
- Layer Height: 0.2 – 0.3 mm
- Infill: 25%
- Supports: None

- When slicing the files, some holes may appear covered.
- This is intentional to help the slicer create bridges and simplify the printing process.
- After printing, clear the holes using a screw, screwdriver, Allen key, or matching-size bolt.