How to model a tunnel section in rhino-grasshopper

You have posted a Rhino 7 (R7) .3dm file. Some of us are still using R6 and can’t open that file.

You can either ‘File | Save as’ R6 format or internalize your relevant geometry in the Grasshopper file.

Or not and get help only from R7 users. McNeel now wants annual $400 to $600 upgrades. :frowning:

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