Contents Designing » Intersecting » Combine and Split Tools » Merging Surfaces » Creating a Solid from a Self-Intersecting Single SurfacePrint pageCreating a Solid from a Self-Intersecting Single Surface Click Edit > Select. Select the "open" edge of the set of surfaces, shown in black. Click the Combine tool. « Merging Surfaces That Enclose a VolumeRepairing a Self-Intersecting Surface »