Arjun Singh
Factory asked for this specific format and I had no idea how to make it. You guys made it simple. Thank you so much for the help.
STP to 3MF Converter: Free & Online
Convert individual parts or complete assemblies from STP files to 3MF format for precise 3D printing in a single app.
- Free account
- No install
STEP files are converted to a mesh on a MeshInspector server, so the web app asks you to sign in. A free account is enough.
How to convert STP to 3MF
Open the web app
Click Open in web app and sign in or create a free account. The web app needs it to convert STEP files on a MeshInspector server.
Open your .stp file
Click Open Files and pick the file. MeshInspector turns the CAD surfaces into a triangle mesh.
Export as .3mf
Click Export, choose .3mf in the Extension list and click Save. The file downloads to your computer.
In the desktop app
- Install and sign in. Download MeshInspector for Windows, macOS or Linux and sign in. The free Community plan is enough.
- Open the file. Click Open Files and pick the .stp file.
- Export. Select the model, click Export and choose .3mf.
- Save. Pick a folder and save the .3mf file.
What to know about STP → 3MF
- STP is the same STEP CAD format under another extension: exact surfaces and solids, not triangles.
- 3MF is a ZIP package around an XML model: it records units and can hold several objects and colors.
- MeshInspector opens STEP and exports the mesh it makes from it; in the web app STEP needs a free account.
- MeshInspector opens STP files but does not save them: STP is import only.
- A 3MF from a slicer may also carry plate layout and print settings; a plain mesh format keeps only the geometry.
Online or desktop
Online
The MeshInspector web app opens STEP files after you sign in with a free account. No install is needed.
Desktop
The desktop app runs on Windows, macOS (Apple silicon) and Linux. Use it for large files, many files, and the tools the web app does not have. The free Community plan covers opening and exporting; see Pricing for what the paid plans add.
FAQ
Do I need an account to convert STP to 3MF?
Yes, a free one. A .stp file is converted to a mesh on a MeshInspector server, so the web app asks you to sign in; the free Community plan is enough. Then click Open Files, pick the file, click Export, choose .3mf and save it.
Is the STP to 3MF converter free?
Yes. Opening STEP files and exporting the mesh as .3mf are part of the free Community plan, in the web app and in the desktop app. Paid plans add tools such as Mesh Healer and automatic repair; the Pricing page lists what each plan includes.
Is my STEP file uploaded?
Yes. To turn the CAD surfaces into a mesh, the web app sends the .stp file to a MeshInspector conversion service, as the Privacy Policy describes. Mesh files such as STL, OBJ, PLY and 3MF are opened in your browser instead.
Are colors and units kept?
3MF records units, while the source format may not, so check the size of the model after conversion. 3MF can carry colors and several objects, but the export writes the mesh geometry of the selected object, so check the result in your slicer before printing.
Is there a file size limit?
There is no fixed limit, but the web app works within your browser's memory: up to about 4 GB, or 16 GB in browsers with 64-bit WebAssembly. For large assemblies, or many files, use the desktop app for Windows, macOS or Linux.
Free Community planWindows, macOS (Apple silicon) and Linux
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By Mesh Inspector TeamPublished: Updated:
