Why does OrcaSlicer fail to load my file?

The most common causes are a truncated download, a renamed non-mesh file, an incomplete 3MF package or a mesh with invalid geometry. The signature and parse checks here narrow down which one you have.

Is OrcaSlicer compatible with Bambu Studio 3MF projects?

Compatibility is not guaranteed across slicer-specific project metadata. A standard 3MF or STL export is safer when the file needs to move between applications.

Why is my model the wrong size in OrcaSlicer?

STL and OBJ do not declare print units. If the bounds are 1000× or 25.4× off, correct the source units and re-export instead of scaling the model in the slicer.

Can OrcaSlicer repair a bad STL automatically?

It can attempt repairs, but success depends on the defect. Boundaries, non-manifold edges and self-intersections are safer to address before import so the slicer receives a predictable mesh.

Does this page upload the model or send it to OrcaSlicer?

No. The checker is independent of OrcaSlicer and runs entirely in this tab. The file is parsed in a Web Worker and no bytes are uploaded.

Slicer import fixes

OrcaSlicer STL import error? Find the file problem locally

OrcaSlicer inherits parts of the Bambu Studio and PrusaSlicer workflow, but it still cannot open a file that is structurally broken. A failed import, a model that lands at the wrong scale or a repair that leaves the plate empty is usually a file or geometry problem that can be identified before changing profiles. This page runs those checks locally in your browser.

OrcaSlicerNo uploadSlicers · Windows / macOS / Linux

Typical symptoms

The import fails or the object never appears on the plate.
A 3MF project opens with missing parts or an empty object list.
The model is scaled by a familiar factor such as 10, 25.4 or 1000.

File import check

No upload

OrcaSlicer

The detected signature, bounds and topology are reported locally. These are triage signals, not a slicer validation.

File checks

The detected signature, bounds and topology are reported locally. These are triage signals, not a slicer validation.

Detected file signatureBoundary edges · Non-manifold edgesTypical symptoms

Drop the file that won't open

STL, OBJ, PLY, 3MF, GLB, glTF, or a .gltf with its .bin companions. The file is read locally.

Choose a file

Max file size: 500 MB · No upload

No upload · Worker

Typical symptoms

The import fails or the object never appears on the plate.
A 3MF project opens with missing parts or an empty object list.
The model is scaled by a familiar factor such as 10, 25.4 or 1000.
Automatic repair completes but the preview still shows gaps, flipped faces or non-manifold edges.

Common causes

The file is incomplete or mislabeled

A browser error page saved as .3mf, a partial download or a renamed mesh can look valid in the file picker while failing the format check inside OrcaSlicer.

The mesh is open or self-intersecting

OrcaSlicer may repair simple defects, but a heavily open surface or overlapping shells can produce missing layers and unstable slicing. The topology report separates these cases.

The 3MF project metadata is incompatible

A 3MF created by a different slicer may contain settings or object structure OrcaSlicer does not expect. Exporting a standard model file is often more reliable than importing another slicer's project.

The export uses the wrong units

STL and OBJ do not carry reliable print units. Metres, inches and millimetres can all produce a valid file at the wrong physical size; the bounds check makes the mismatch visible.

Export checklist

1
Export a binary STL or a standard 3MF in millimetres and check the file after downloading it.
2
Keep one object per file unless the slicer project needs a deliberate multi-part arrangement.
3
Apply transforms and place the object near the origin before export.
4
If a 3MF project fails, try exporting the geometry as STL to separate a project issue from a mesh issue.

How it works

1
Drop the file and confirm the detected signature and triangle count.
2
Check for empty geometry or a scale error using the reported bounds.
3
Review boundary, non-manifold and self-intersection findings before slicing.
4
Use the repair links to create a new cleaned mesh, or re-export from CAD if the file is unreadable.

Questions

References

https://github.com/SoftFever/OrcaSlicer
https://github.com/SoftFever/OrcaSlicer/wiki
OrcaSlicer GitHub repository
OrcaSlicer project wiki
3MF core specification packaging model

Specs verified: 2026-11-01

Each page checks the file header, triangle count, bounds and topology in this tab. No account, upload or slicer integration.

Other slicer checks

Cura

Check an STL, OBJ, PLY, 3MF, GLB or glTF for corrupt headers, empty geometry, open boundaries, non-manifold edges and unit mix-ups before you blame Cura. The model stays in this tab.

Open diagnostic

Bambu Studio

Diagnose an STL or 3MF that Bambu Studio will not open: header damage, empty geometry, open boundaries, non-manifold edges and scale errors. Local analysis, no upload.

Open diagnostic

PrusaSlicer

Check why PrusaSlicer shows no layers, a tiny model or an import error. Inspect headers, empty meshes, open boundaries, non-manifold edges and units locally before re-exporting.

Open diagnostic