Hi 
test showing correctly generated shell
Currently I’m finishing a very nice tool: A non overlapping Shell tool. I have made in the past our current Shell tool but it is a common shell algorithm found in virtually every 3D package: it just offset object surface, so if you need an object of a given thickness for 3D printing or other use where it “must” have that thickness and no other, unless you manually tweak the previous generated shell and depending on the complexity of the model …you are out of luck.
With this new tool, no matter the thickness value you want, it will be correctly calculated, so overlapps will just be solid or welded as a real solid objects with cavities should do.
Algorithms develop for this tool can be useful in other parts of 3DCoat too, it was my first slip on “remesh” type tools…so who knows what the future may bring? 
