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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The line around the object I believe is meant to purge and fill the nozzle. Without it, there’s a chance you start printing and a big chunk of your first layer doesn’t have any filament.