Hi Pilou,

> In your image I see only one? Or they are very close?

Ok, I see what you mean - I would just throw one of those and then after you construct the new surface use Shell to thicken it into a solid, rather than repeating the steps again although that would be work as well.

But it looks like maybe you are saying that the original object is not a proper shell to begin with? If so then yes you would need to repeat the steps for each surface then instead of using shell.

- Michael