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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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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.
The second part is a nozzle cleaning. It wipes the nozzle on a part of the bed that won't be used for printing to get debris off of it before printing. Cura does the same thing on my tevo tornado and actually sends a message saying what it's doing so when I'm logged into reprapfirmware it says "cleaning nozzle"