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'extra perimeters when needed' always enforces minimum 2 perimeters #2395
note this model also exposes problem with infill not anchored at perimeters (note how you can even see honeycomb infill from layers below visible in many places on screenshots)
just tried 1.2.4 and it's also affected.
you get 1 perimeter result gcode file, even though it is not perpendicular to the table.
extrusion compensation (the more angle the more extrudate) could help to gap this problem, and would also solve
added a commit
Feb 15, 2015
Good catch there. I reimplemented the detection algorithm for extra perimeters. Your test case now has the extra perimeters in a very limited number of cases, which makes sense. Further testing will tell us if this implementation is correct.