I have a thick wall that I would like to shell 4 times on the outside and only twice on the inside... is this possible?
the "inside" you talk about here is probably a "hole in the object". slicers don't see it that way, the "inside" is where the infill goes ... so if you have for e.g. a hollow cube, inside diameter 10mm, outside diameter 30mm, so you have 10mm walls, the 10mm hollow cube inside the 30mm cube is "outiside" for the slicer and the perimeter will always be same as the visible one..
as you can see on the attached image, the "dark blue" is "the most-outside" perimeter, light blue is "inside perimeter" red is infill ... the red is what slicer sees as "inside", the inside hole of this object, or what you see as inside hole, is the "outside of the object" for any slicer, and that wall do not differ from any other, visible, wall
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