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My printer (well, PrusaSlicer) always starts with a line around the object I am printing. See (1) in the image. --Why? What does that do?
There is also this line (2) at the front of the bed. --Why? What does that do?
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this post was submitted on 12 Oct 2023
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In addition to what others have said, it also gives you an indication of how well leveled your bed is in the immediate area of the print.