G4 S1
M80
G4 S1
G90    ;use absolute coordinates
G21    ;Set units to millimeters
M107    ;Turn off cooling fan
M220 S100  ;reset feedrate
M221 S100  ;reset flowrate
G28    ;Home
G1 Z10  ;raise z
M190 S[first_layer_bed_temperature]   ;wait for bed temp
M109 S[first_layer_temperature]    ;wait for extruder temp
G92 E0      ;reset extruder
G1 E4 F200    ;prime the filament
G1 X7 Y10 F5000  ;start position
G1 Z0.25    ;lower z
M117 Start Clean  ; Indicate progress on LCD
M300 S0 P250
M300 S440 P200
M300 S660 P250
M300 S880 P300
M300 S0 P250
G1 X7 Y160 E22 F200  ;1st line
;G1 Z2      ;raise z
M117 Printing

Стартовый код из мануала Flying Bear

G21
G90
M82
M107
G28 XO YOs
G28 ZO
G1 Z3.0 F3000
G92 EO
G1 X20 Y20.0 Z0.28 F3000.0
G1 X20 Y170.0 Z0.28 F1500.0 E12
G1 X20.3 Y20.0 Z0.28 F1500.0 E18
G92 EO
G1 Z1.0 F3000
M117 Printing
G5

G91 ;use relative coordinates
G1 E-8 F1200 ;retract the filament
G1 Z+5 F1200 ;raise z
;G1 X5 Y5 Z0.2 F5000 ;wipe
G90 ;use absolute coordinates
M107 ;turn off fan
M104 S0 ;turn off hotend
M140 S0 ;turn off heatbed
G1 X245 Y195 ;Go Max X & Y
M84 ;disable motors
M117 Done
M300 S0 P250
M300 S1174 P46
M300 S0 P46
M300 S1174 P46
M300 S0 P46
M300 S1174 P46
M300 S0 P46
M300 S1567 P46
M300 S0 P46
M300 S1567 P46
M300 S0 P46
M300 S1567 P46
M300 S0 P46
M300 S1174 P46
M300 S0 P46
M300 S1174 P46
M300 S0 P46
M300 S1174 P46
M300 S0 P46
M300 S880 P46
M300 S0 P46
M300 S880 P46
M300 S0 P46
M300 S880 P46
M300 S0 P375
;End

;The code differs from that provided by the manufacturer

G91 ;Relative positioning
G1 E-2 F2700 ;Retract the filament
G1 E-2 Z0.2 F2400 ;Retract and raise Z
G1 X5 Y5 F3000 ;Wipe out
G1 Z10 ;Raise Z more

G28 X0 Y0 ;Home X and Y

M106 S0 ;Turn-off fan
M104 S0 ;Turn-off hotend
M140 S0 ;Turn-off bed

M84 X Y E ;Disable all steppers but Z