Why I can't do a boolean union in this case?

Hi Viva -

Actually, no! Well trimming yes, some Join, but to finish the job In this case where you need non-manifold edges - where I originally thought you were making a ‘physical’ model and needed to add thickness to avoid the collisin that you actually want for the FEA mesh - so the command isNonManifoldMerge is the one.
The inputs were not quite as precisely lined up as needed -if the result is what you want, I’ll make you a file with some details.

-Pascal

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Okay! Well i think this thread is resolved! Great job guys, thanks very much @pascal @jeremy5 !

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