Hi Martin, sometimes you can find problem areas for shelling by doing an offset instead, Shell basically does an offset type operation followed by a boolean, when you just do the offset by itself you will often get a result but you'll see where it's having problems.
So in this case, if I do an Offset with distance: 0.1mm with Flip turned on, then delete the original object, you'll get a result but you'll see that there are a few weird holes in a couple of the surfaces, those seem to have messed up trimming boundaries.
It probably is possible to fix those up by doing some untrimming and retrimming of the surfaces but it's probably easier to try and do the Shell in a different CAD program that has a more robust shelling mechanism, the one in MoI is just not very sophisticated I'm afraid. ViaCAD can be a good companion to use with MoI for shelling.
- Michael
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