Hello!
I have problem with some missing layers. When i Slice my slt and model have level middle of object, slicer drops one or two layers. This happens if model have holes and when model have straight levels. Holes drop layers at bottom tangent. Here is two pics from sliced objects.
Problem was "solved" at hole case by setting adaptive layer height on, but even then there was left weak interface at the bottom of hole.
-Raimo