The File Extensions Database

.3DM File Extension

  • Developer by: Robert McNeel & Associates
  • Category: 3D Image Files
  • Format: Binary

What is an .3DM file?

.3DM is Rhino 3D Model

A 3DM file is an open-source 3D model format and native file format for Rhinoceros. It contains a 3D model which includes surface, points, and curve information. 3DM files allow CAD, CAM, CAE, and computer graphics software to accurately save and exchange 3D geometry using both NURBS and polygon mesh representations.

The 3DM open-source library is available at

Programs that open Rhino 3D Model
McNeel Rhino
Autodesk Fusion 360
McNeel Rhino OSX
IMSI TurboCAD Deluxe

How to solve problems with 3DM files

  • Associate the 3DM file extension with the correct application. On :
    Windows: Right click on any 3DM file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.3DM files". Mac: Right click (or Ctrl-click) the 3DM file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .3DM is Rhino 3D Model. Because only the current version supports the latest 3DM file format. Search, therefore, e.g. on the Robert McNeel & Associates manufacturer website after an available .3DM is Rhino 3D Model update.
  • To make sure that your 3DM file is not corrupted or virus-infected, get the file again and scan it with antivirus software.