Closed open polysurface which openings dont have closed, planar loops of edges

[davidcockey]

@cam

I indeed woul dlike a closed polysurface as mentioned in your first sentence, but without the small part of the bigger polysurface (cf my number 4). In otherwords can not make 4) a closed polysurface by triming and then booleen union on the result.

BooleanUnion worked for me to create a single closed polysurface from the two objects in 4,

@cam

COcnerning your last paragraph, this is very interesting! So it means, that we can not have a closed polysurface composed of objects that are just touching? I used offset multiple command with the distance beeing teh exact circle diameter which I used the to sweep around each of those. If I understood correctly I should do offset multiple but using a smaller distance between each object than the size of the future ‘sweep objet’?

You can have two closed polysurfaces which happen to touch along a line or curve, but you can not combine them into a single closed polysurface. Move the surfaces so that they overlap by a small amount and you can create a single closed polysurface.