1. In the Manufacturing workspace, click the Utilities tab > Add-Ins drop-down menu > Export Model From Setup.
2. Select any solid bodies you want to export.
3. Select OBJ for Mesh Format.
4. Select the Setup you’d like to use as your origin.
5. Enter a name for your model.
6. Click Ok.
7. Select a folder to save your model to.

Installation:

1. Download the installer from the Autodesk App Store.
2. Right-click on the "Downloads" folder and select "Open in Finder".
3. Right-click on the downloaded .pkg file -> "Open With" -> "Installer".

Uninstall for Mac:
You can unload the add-in without uninstalling it by clicking the "Stop" button when the add-in is selected in the list box on the "Add-Ins" tab of the "Scripts and Add-Ins" dialog.
Unchecking "Run on Startup" causes the add-in not to be loaded in future sessions of Autodesk® Fusion®.
- Navigate to the ./ApplicationsPlugins folder and select the app bundle you want to uninstall
- Either drag the app bundle to the Trash or right-click and select “Move to Trash”
- Right-click on the Trash Can and select “Empty Trash”
- If you prefer keystrokes, you can also just select the app bundle and then hit Command+Delete to move the app to Trash, then empty the Trash and the app will be removed.