Choose a STEP file
Drop your STEP model into the converter or select it from your device.
3D ConverterSTEP to 3MF
Runs locally in your browser
STEP to 3MF Converter
Convert STEP to 3MF directly in your browser, then inspect and download the result. STEP / STP input is tessellated to a mesh. Assembly semantics, CAD history and source materials are not retained in this workflow. Geometry-only 3MF via STL. Materials, colors and animation are discarded; verify millimeter scale in your slicer.
STEP / STP input is tessellated to a mesh. Assembly semantics, CAD history and source materials are not retained in this workflow. Geometry-only 3MF via STL. Materials, colors and animation are discarded; verify millimeter scale in your slicer.
Drop your STEP file here
or choose a file from your device
Up to 100 MB total. Select accompanying textures, .bin and .mtl files together with the model. External URLs are not fetched.
Output format
3MF
Local conversion — the file stays on this device
How to convert STEP to 3MF
Validate and convert
The converter checks the source format before processing the model geometry.
Download the 3MF
Save the generated 3MF file and open it in your preferred 3D application.
Browser conversion
How STEP becomes 3MF
Source fileSTEP
Browser conversion3D
Output file3MF
STEP / STP input is tessellated to a mesh. Assembly semantics, CAD history and source materials are not retained in this workflow. Geometry-only 3MF via STL. Materials, colors and animation are discarded; verify millimeter scale in your slicer.
Data map
What survives STEP to 3MF
This map describes the exported result, not the original source file. Review every amber item in the receiving application before relying on it.
GeometryPreserved
MaterialsNot retained
TexturesNot retained
Animation & riggingNot retained
Units & orientationReview
CAD featuresNot retained
About STEP to 3MF conversion
STEP / STP input is tessellated to a mesh. Assembly semantics, CAD history and source materials are not retained in this workflow. Geometry-only 3MF via STL. Materials, colors and animation are discarded; verify millimeter scale in your slicer.
Conversion quality
CAD and mesh formats describe geometry differently. This workflow may tessellate CAD or create faceted geometry; it does not restore feature history, constraints or assembly intelligence.
Related converters
3D ConverterBefore you convert
What is preserved when converting STEP to 3MF?
STEP / STP input is tessellated to a mesh. Assembly semantics, CAD history and source materials are not retained in this workflow. Geometry-only 3MF via STL. Materials, colors and animation are discarded; verify millimeter scale in your slicer.
When is 3MF the right output format?
Choose this output when preparing a static model for a slicer or 3D-print workflow; confirm units and watertightness before printing.
What should I check after converting STEP to 3MF?
CAD and mesh formats describe geometry differently. This workflow may tessellate CAD or create faceted geometry; it does not restore feature history, constraints or assembly intelligence. Open the downloaded file in the application you plan to use. Check scale, orientation, mesh completeness and the format-specific limits described above before printing, manufacturing or production use.
Where is my model processed?
Available converters process files in your browser. Saving to the workspace stores a GLB copy in this browser's local database; clearing site data removes it.