Boolean problem in Rhino 5

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.


Your issue is coincident surfaces. Rhino can’t figure out which ones to keep. You have to keep that in mind when modeling. Not all is lost, you can just manually delete and trim away to get your desired form.

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Many thanks, Stratos. Wasn’t aware of this. Regards, Michael