Struggling to open a 3DM file? Here's a simple guide to help you out. A 3DM file is a CAD file format commonly used in Rhino software. To open a 3DM file, you will need to have CAD software installed on your computer. If you already have Rhino installed, simply double-click the 3DM file, and it should open in the Rhino environment. If you don't have Rhino, you can still open 3DM files using other CAD software like AutoCAD, SolidWorks, or Fusion 360. Some online CAD viewers also allow you to view 3DM files without needing to install any software. To open a 3DM file in other CAD software, you can go to 'File' > 'Open' and select the 3DM file from your computer. Once the file is open, you can view and edit the 3D model as needed. Don't let the 3DM file format intimidate you - with the right software, opening and working with 3DM files is a breeze!