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I havent got as far as using a slicer yet, is it the slicer and not the mesh/cad software that does hollowness?
Also not quite sure what you mean by 2 or 3 shells, if somethings hollow doesnt it...

ok so I saw another post explaining uploads arent working so Ive uploaded the file to another forum so it can be grabbed
https://www.3dhubs.com/talk/thread/some-help-thinning-stl-ear

I work in Prosthetics and this is my first try using 3d priting. We scanned an ear and obtained some skin like elastic filament to print it in.
Even the softer filament is stiff when printed so I...