Solid Union problem

Good evening
I’ve been trying to connect the elements all day. Unfortunately, it keeps deleting the overlapping parts for me.
The solid union is somehow flawed



Solid union problem.gh (1.8 MB)

Boolean operations are meant to be used on solid (ie closed) polysurfaces, not open surfaces.

Oops. How can I correct that?

Ongoing investigations :sweat_smile:

Group by common absolute normal vector => gives groups of 2 or 4, then group by common plane by closest point distance => groups of 2, then Region Union.

Solid union problem.gh (1.8 MB)

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Wow. Thanks for your quick help.