export failed Boolean.3dm (1.0 MB)
A Rhino 5 file is attached. Trying to make a boolean union. The project has one main polysurface to which I wish to add three identical polysurfaces. All the polysurfaces are closed and they all inter-penetrate.
I think I have ruled out most of the more obvious types of Boolean problems. What have I missed?
Thank you for your insights.