Hi Pilou,

re:
> You can use after the Separate the native hidden function ExplodeMove then Shell

I would not recommend that because then you would have a whole bunch of solids with overlapping surface areas that would need to be removed. When trying to do a boolean on something like that it makes it difficult because you're telling it to make surface/surface intersections on many coincident or nearly coincident pieces.

That's why it's better to do an offset of the individual surfaces to make a surface result to combine using Join and not try to make a whole bunch of individual solids for this kind of case.

- Michael