Make selection of the settings as needed. Select the style for the mass element.

Select layer or inherit the layer of the polyline. Specify the extrusion depth. Add property set automatically will add any property set that applies to mass element objects.

For angled timber it can be useful to select prompt for alignment axis 2 points. If the polyline should be deleted select erase 2D geometry. Click on Select Polylines and select one or multiple polylines. Press OK.

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

On Windows 10 Version 1703 or later press Windows+I on the keyboard to access Settings or click the lower-left Start button on the desktop to expand Start Menu, and then select Settings in it. Click on Apps. On Windows 7/8.1/10 (older than Version 1703) click Control Panel > Programs > Programs and Features or Control Panel > Add or Remove Programs.

For more about TimberTool.