This issue here seems relatively resolved, but I'd like to add a note for anyone (like me) who landed on this thread with a similar issue.
I am using a cutting mesh to subtract an irregular shape from the top of a model (normal mesh). I found that three additional roof layers generated on the very top of the normal mesh, inside the cutting mesh—which otherwise worked fine. I removed those excess floating roof layers by:
- setting global roof layers and thickness to 0
- setting cutting mesh specific roof layers (along with infill, bottom layers, and walls) to 0
- setting normal mesh part's specific roof layers and thickness to my standard settings
This seems to circumvent the initial issue, or at least a similar issue I had.