start gcode moves to center

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
G92 E0     ; reset extruder
G1 X10 Z2 E3 ; move z up and x in and a little extrude avoid print bed edge
G1 Z0 ;
G1 X100 E50 F500 ; Draw a line
G1 Y1 ; WHY DOES THIS GO TO CENTER?
G1 X10 E50 F500 ;
G1 Y2 ;
G1 X100 E25 F500 ;
G1 Y3 ;
G1 X10 E10 F500 ; G1 Z15.0 F4800 ;move the platform down 15mm
G92 E0                  ;zero the extruded length
; G1 F200 E3              ;extrude 3mm of feed stock
; G92 E0                  ;zero the extruded length again
G1 F4800
;Put printing message on LCD screen
M117 Printing...