Thanks for your suggestion. I have checked the layer view in Cura ... And, yes I found there that the misprint was already visible (no reason to start printing!).
I went back to my original design in Sketchup and found that in the pats were Cura showed the misprint, the object was having unlogical components. I changed that, exported to STL, reloaded in Cura and checked the layer view again: no errors!
At the moment I am printing again. I will let you know the outcome of that.
It might be some flipped normals or some polygons standing strange... obviously something Netfabb cannot repair.
What does it look like in the layer view of Cura?
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