polysurface.3dm (14.9 MB) How can I convert open polysurface to closed polysurface (solid)
Attached is my 3d file.
There is a hole in your model. The ShowEdges command can be used to find naked edges which are edges not joined to other edges.
Your model has a huge number for the shape. Was the surface model created using MeshToNURBS command? That command creates a separate surface for every mesh face and should not be use except in special situations.
