Hi Marco, unfortunately the shell command in the geometry library is not very robust, there are a lot of things that can get it confused. There is probably some case where it's the reverse from what you show.
But it is true that shelling can be simplified with more pieces that match up naturally edge-to-edge, so if you are focusing on using that it may be worth a try. But really if you need to do a lot of shelling, MoI's shell function is probably not going to do the job for you in many cases, so you may need to do your shelling in some other program for now.
Another way you could make things easier for shelling could be to build more of your part all from one larger Loft rather than doing it in separate pieces and blending, if you want it to look like one large flowing surface. See the attached file where I used Loft with the Loft style = "Loose" option to build the starting piece.
- Michael
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