This add-on uses the rhino3dm.py module (https://github.com/mcneel/rhino3dm) to read in 3dm files.

This code is currently being written directly for Blender 2.80, even though it is still pre-beta. In general the latest 2.80 build for your platform from Blender Builder should be fine.

The add-on will automatically install all dependencies in user-writable locations.

• Note on MacOS some preparations need to be done, see next section
• Start Blender 2.80
• In top menu press Edit > User Preferences...
• Select the section Add-ons
• In the bottom of that window select Install add-on from file...
• Browse to where you saved the zip file, select it and press the Install add-on from file button in the top right of the file browser
• There may be exceptions and warnings, look in the output to see if you need to do anything (note: on Linux you'll most likely will have to run the pip installation manually. The terminal will have the line to run)
• Restart Blender.

If you just now downloaded Blender 2.80 you can either use the operator search menu by pressing F3, or through File > Import.

• Blender 2.80 installed in Applications. For newer versions adapt the path according version
• open a terminal
• type cd /Applications/Blender.app/Contents/Resources/2.80/python
  • first we remove the old pip in the site-packages (if any):
    • rm -rf ./lib/python3.7/site-packages/pip*
  • now we install pip3.7
    • ./bin/python3.7m ./lib/python3.7/ensurepip
  • check pip3.7 (and pip3) are installed in the expected location
    • ls ./bin
    • ensure listing gives pip3
  • you should now be ready to install the import_3dm add-on as per instructions in the Installation section.