To Fill Inner Loops
When you fill an inner loop of edges on a surface selected for gathering it is equivalent to "patching" the base quilt of the Mill Volume. The volume will be built as if there was a smooth surface with no perforations. The Fill option opens the GATHER FILL menu:
• All—Fill all loops on a selected surface. Select a surface. All inner loops on this surface will be filled, whether they belong to bounding surfaces or not.
• Loops—Select loops to be filled. For each loop to be filled, you have to select only one edge. If you gather using Surf & Bnd, the edges must lie on the bounding surfaces. Select additional bounding surfaces if necessary.