Untrim Surface - Patching a Surface To strengthen the base of the model, use the Untrim Surface tool to patch one of the surface cuts. Click Untrim Surface on the Surfaces tab. Select Edge1 in the graphics area for Selected Face/Edges in the PropertyManager. The Untrim Surface tool extends an existing surface along its natural boundaries, so you can select any edge from Surface-Trim3. Under Options: Select Extend edges. Select Merge with original. Click OK . Parent topicSurfaces Previous topic Delete/Keep Body - Deleting Trim Tools Next topic Thicken Surface - Creating a Solid