Why is My First Layer Rough?
Common causes
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Nozzle too high: visible gaps between lines, lift on the corners
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Nozzle too low: squished crunchy first layer, plastic squeezed out
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Dirty bed: wipe with isopropyl alcohol before every print
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Bed temperature wrong: try the top of the material range (60 C PLA, 80 C PETG)
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Wet filament: foams at the nozzle, leaves rough surface
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First layer adhesion troubleshooting.
