Free 3D converter / 3DM to STEP
Convert 3DM to STEP, free and online
Turn a .3dm file into a .step file. It runs in your browser: no sign-up and nothing to install, and most files never leave your computer.
Drop your 3DM file here
or choose a file
Free · No sign-up · Converted in your browser · Files up to 1 GB
How to convert 3DM to STEP
- 1Drop your .3dm file
On the converter above, or click to choose it. - 2Click Convert to STEP
The .step file downloads straight away.
3DM vs STEP
3DM: 3DM is Rhino's own format. We read the display meshes Rhino saves with each object.
STEP: STEP (ISO 10303) is the CAD exchange format: SolidWorks, Fusion 360, Inventor, CATIA, Creo, Onshape and FreeCAD all read and write it. It describes exact surfaces, not triangles.
A 3DM has no curves, only triangles, so the STEP is made of the same triangles as flat faces. It opens in SolidWorks, Fusion 360, Inventor, FreeCAD and the rest, and you can measure it and use it as a reference, but its curved surfaces aren't editable features. A closed mesh comes in as a solid; an open one as a surface body.
Other conversions
All conversions →Is the 3DM to STEP converter free?
Yes, with no sign-up and no limit on the number of files. A free account is only needed if you want to send the model to someone for feedback.
Is my file uploaded?
Most files are read and converted right in your browser and never leave your computer. Very large CAD and mesh files are converted on our server instead, then deleted straight after the converted model is sent back to your browser.
What's the biggest 3DM I can convert?
Up to 1 GB. Big files take longer, and very large CAD files go through our server, as above.
Can I edit the STEP file in SolidWorks or Fusion 360?
You can open it, measure it and use it as a reference or for simple cuts, but it's made of flat triangular faces, so there are no features or editable curves. For an editable part, rebuild it in your CAD program using the STEP as a guide.
What units is the STEP in?
Millimetres, which is what CAD programs and slicers expect.
Converting it to send to a client or supplier?
Send them a link instead. They open the model in any browser, with no account and no CAD program, and click the spot they want changed.