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Cura 3.5 Thin Wall prints as ZigZag Top/Bottom

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I have a part that is 1.2mm thin. It should print as 3 lines as in Cura 3.4.1.

In Cura 3.5 it print's as ZigZag. This makes lots of vibrations on the part.

 

Tried to change the Minimum Wall Flow 0-20% without effect.

Tried with 0 and 100 infill without effect.

 

In the image the desired result is on the left.

Cura ThinWall.jpg

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That wall is being printed as an outer wall and a skin. There's no inner wall in either case (it would be green not yellow).  So Cura must think that the gap is too narrow to fit a wall into. Try reducing the line width slightly and it may then fit the inner wall in and with overlap compensation enabled and the min wall flow hack enabled, it should print as a single inner wall (green) surrounded by an outer wall (red).

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