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Those lines I assume are within the part - where there would be infill for example (if infill is not at 0%).
There is a feature related to retraction called "combing". There is where cura tries to not bother retracting and instead try to move to the next shell position without going ouside the part. In some cases it has to make crazy paths to get there - in this case it just can move directly. If you disable combing it will move in the same pattern but do a retraction.
Some people hate these lines on the bottom layer only so you can also just turn off combing for the bottom layer.
In addition there are other retraction features that might be blocking retraction: minimum retraction distance, etc but I think you just want combing turned off (for this part - don't turn it off for everything).
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gr5 1,870
Those lines I assume are within the part - where there would be infill for example (if infill is not at 0%).
There is a feature related to retraction called "combing". There is where cura tries to not bother retracting and instead try to move to the next shell position without going ouside the part. In some cases it has to make crazy paths to get there - in this case it just can move directly. If you disable combing it will move in the same pattern but do a retraction.
Some people hate these lines on the bottom layer only so you can also just turn off combing for the bottom layer.
In addition there are other retraction features that might be blocking retraction: minimum retraction distance, etc but I think you just want combing turned off (for this part - don't turn it off for everything).
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