Need to convert a Rhino 3DM file without a Rhino license? Whether you're an architect moving models into SketchUp, a designer exporting to OBJ for Blender, or an engineer preparing a STEP file for a manufacturing partner, Autoconverter converts 3DM files to over 30 formats - free for up to 10 conversions, with no subscription required.
Supported Output Formats from 3DM
Autoconverter exports Rhino 3DM files to the following formats from the same source file:
- SKP - for SketchUp architectural visualization and presentation (choose target SKP version on export)
- OBJ - for Blender, Maya, 3ds Max, game engines, and rendering pipelines
- STL - for 3D printing (FDM, resin, SLS) and additive manufacturing
- STEP - for SolidWorks, CATIA, Creo, Inventor, and other engineering CAD tools
- FBX - for Unity, Unreal Engine, Maya, and animation pipelines
- DAE - for Collada-compatible cross-application workflows
- 3DS - for legacy Autodesk 3ds Max compatibility
- IGES - for legacy engineering exchange
- PLY - for 3D scanning and point cloud workflows
All supported Rhino versions are covered: 3DM files from Rhino 2.x through Rhino 8.x open correctly without Rhino installed.
How to Convert Rhino 3DM Files for Free: Step-by-Step
📥 Download and Install Autoconverter
Download Autoconverter from the product page and run the installer on Windows. Choose the 32-bit or 64-bit version to match your system. The free trial activates automatically - no license key, no account, no credit card needed. After installation, launch Autoconverter from the Windows Start menu.
📂 Open Your 3DM File
Click Open... and select your .3dm file, or drag and drop it into the Autoconverter window. The model loads into the 3D viewport - use zoom, pan, and rotate to inspect the geometry before converting. Both NURBS surfaces and polygon meshes from the 3DM file display correctly.
💾 Export to SketchUp SKP
Click Save As... and select Trimble SketchUp (*.skp) from the format dropdown. If you need compatibility with a specific older SketchUp version, select it in the save options before clicking Save. The 3DM geometry is tessellated (NURBS surfaces converted to polygon mesh) and saved as a native SKP file ready to open in any SketchUp version.
📤 Export to OBJ
From the same loaded 3DM file, click Save As... again and select Alias Wavefront (*.obj). Autoconverter writes the OBJ file alongside an MTL material file and any texture images - keep all three in the same folder when importing into Blender or Maya for materials to display correctly.
🔄 Export to STL, STEP, or Other Formats
Repeat the Save As step for any additional output formats needed from the same source file. Each export counts as one conversion against the 10-conversion free trial limit. Common additional exports from a 3DM file include STL for 3D printing and STEP for engineering CAD systems. You do not need to re-open the file between exports.
Frequently Asked Questions
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Is the 3DM converter really free?
Yes. The free evaluation version of Autoconverter supports up to 10 file conversions with no time limit on the trial period. No account, no credit card, and no subscription is required to use the trial. Upgrade to the full version for unlimited conversions and batch processing.
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Which Rhino versions does Autoconverter support?
Autoconverter reads 3DM files from all Rhino versions: Rhino 2.x, 3.x, 4.x, 5.x, 6.x, 7.x, and 8.x. Both older legacy files and the latest Rhino 8 format open correctly.
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Will NURBS geometry be preserved when converting 3DM to OBJ or STL?
OBJ and STL are mesh formats - they cannot store mathematical NURBS surfaces. When converting 3DM to OBJ or STL, NURBS surfaces are tessellated (approximated as polygon mesh) during export. For conversions that preserve NURBS geometry, export to STEP or IGES instead using Autoshaper.
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Can I convert 3DM to STEP without Rhino?
Yes. Autoconverter exports 3DM to STEP natively - Rhino is not required. The STEP output imports as solid body geometry in SolidWorks, CATIA, Creo, NX, Inventor, and other engineering CAD tools.
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How do I batch convert many 3DM files at once?
Use File > Batch Convert... in Autoconverter. Batch conversion is available in the full licensed version and processes entire folders of 3DM files to any output format automatically.
Summary
Autoconverter's free trial converts Rhino 3DM files to SKP, OBJ, STL, STEP, FBX, DAE, and other formats - up to 10 times at no cost, with no Rhino installation required. The full licensed version adds unlimited conversions and batch processing for large-scale workflows.
👉 Ready to convert? Download Autoconverter and start converting 3DM files free today.