Probes the bed and ends with the nozzle at the Z=0 plane; present in most MK3 start gcode.
Seen in: virtually every Prusa MK3 start gcode.
Behavior: probing moves can be skipped; the position outcome is what matters (nozzle returns to Z=0).
Gotchas: G80 is Prusa-specific here — in standard/Marlin gcode G80 means "cancel motion mode"; bare G28 on MK3 also triggers mesh bed leveling.
Docs: Prusa firmware G-codes
Probes the bed and ends with the nozzle at the Z=0 plane; present in most MK3 start gcode.
Seen in: virtually every Prusa MK3 start gcode.
Behavior: probing moves can be skipped; the position outcome is what matters (nozzle returns to Z=0).
Gotchas: G80 is Prusa-specific here — in standard/Marlin gcode G80 means "cancel motion mode"; bare G28 on MK3 also triggers mesh bed leveling.
Docs: Prusa firmware G-codes