Private 3D-print package inspector
Free Online 3MF Viewer
Drop in a .3mf package to inspect its printable geometry before slicing. The viewer opens the model locally, reports geometry counts and never sends the file to a server.
- ✓ No upload
- ✓ Multi-part models
- ✓ Local inspection
- ✓ Up to 100 MB
Try a local 3MF sample
Choose a classic model to test the viewer before opening your own file.
Sample models from the public common-3d-test-models repository.
What this 3MF viewer checks
3MF is a zipped manufacturing package designed to replace STL in modern printing workflows. It can hold multiple objects, units, colors and print-oriented resources in one file instead of relying on loose sidecar files.
- 01 Choose or drop a .3mf file.
- 02 Let the browser unpack and read its model resources.
- 03 Rotate, zoom and check parts, vertices and faces.
3MF compatibility
| Feature | Status | What to expect |
|---|---|---|
| 3MF model geometry | Supported | Triangle meshes are rendered locally |
| Multiple build items | Supported | Separate scene objects are preserved |
| Object transforms | Supported | Build placement is applied by the loader |
| Basic colors/materials | Best effort | Depends on the package resources |
| Vendor slicer profiles | Not shown | Check these in the originating slicer |
Private local processing
The browser reads the selected bytes and sends them straight to the local parser and 3D renderer. There is no model upload endpoint, account, storage bucket or server-side processing step.
Limits to know
The viewer focuses on visible model geometry. Slicer-specific print profiles, support settings and every vendor extension may not appear. Always confirm final placement, units and print settings in your slicer.
Convert or inspect another format
Frequently asked questions
Is my 3MF file uploaded?
No. The package is unpacked and rendered only inside your browser tab.
Can this replace my slicer preview?
No. It is useful for a quick geometry check, but printer profiles, supports, layer paths and vendor settings still belong in Cura, PrusaSlicer or Bambu Studio.
Why are some 3MF colors missing?
3MF supports several material and extension systems. Basic resources may display, while slicer-specific or unsupported extensions can be omitted by the browser loader.
Can I convert 3MF to STL after viewing it?
Yes. Open the linked 3MF to STL converter to export the mesh locally.