Launch the 3DPOLYFILLET command to create fillet(s) on a single 3D polyline.Launch the M3DPOLYFILLET command to create fillet(s) on a 3D polylines selection.

The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. OR, simply double-click the downloaded installer to install the app/plugin. You may need to restart the Autodesk product to activate the app/plug-in. To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button. OR, click Control Panel > Programs > Programs and Features (Windows 7/8.1/10/11) and uninstall as you would any other application from your system.

The source code is available in the installation folder: %appdata%\Autodesk\ApplicationPlugins\3dPolyFillet.bundle\Contents.