Solid union error

Hi everybody!
I cant union these solids. What am I doing wrong?
I will be glad of any help
error (22.0 KB)


Baking this in Rhino and running the Intersect command, I observe this.

I would suggest to check the section planes of the leftmost Loft.

It is also recommended to boolean union intersecting closed volumes, not touching ones. Maybe try to extend your triangles inside the main box.

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