Código:

M104 S{TEMP0} ; set temperature
G21 ;metric values
G90 ;absolute positioning
M82 ;set extruder to absolute mode
M107 ;start with the fan off
G28 X0 Y0 ;move X/Y to min endstops
G28 Z0 ;move Z to min endstops
M109 S{TEMP0} ;wait on temperature line
G29 ; Auto bed levelling
G92 E0 ;zero the extruded length
G1 F{TRAVEL_SPEED} ;