How does the model look in X-Ray view?
Try playing around with the Fix horrible (Tape-A and Type-B) settings in Expert settings.
However, your model is most probably incorrect. I think it contains faces on the inside.
We already fixed this on the chat. It was sketchup that was up to it's old shenanigans again.
as a Sketchup user I cannot recommend Solid Inspector (2) highly enough.
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DidierKlein 729
Hi and welcome to the forum.
Maybe a picture would help!
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