Gcode Prefix for Nozzle Clean

; Pefix G-Code for most 200mm x 200mm 3D printers by www.DIY3DTech.com to clean nozzle
; Place as start G-Code in Slicer
; Use of this code is at your own risk (no warranties made or implied)
;
M117 Clean ; Indicate nozzle clean in progress on LCD
;M109 S<your temp> ; Uncomment to set your own temp [run warmer to clean out nozzle]
M107 ; Turn layer fan off
G21 ; Set to metric [change to G20 if you want Imperial]
G90 ; Force coordinates to be absolute relative to the origin
G28 ; Home X/Y/Z axis
G0 X1 Y0 Z0.15 F9000 ; Move in 1mm from edge and up [z] 0.15mm
G92 E0 ; Set extruder to [0] zero
G1 Y190 E50 F500 ; Extrude 100mm filiment along Y axis 190mm long to prime and clean the nozzle
G92 E0 ; Reset extruder to [0] zero end of cleaning run
G1 E-3 F500 ; Retract filiment by 3 mm to reduce string effect
G1 X3 Y190 Z15 F9000 ; Move over and rise to safe Z height
G1 X3 Y0 Z15 F9000 ; Move back to front of bed at safe Z height to shear strings
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; Ensure extruder is not reset by other code or it will be 3mm short [see next line also]
;G1 E3 F500 ; Uncomment if you believe exruder will be reset
; Recommend turning off SKIRT in the slicer to avoid strings pulled into first layer
; Begin printing with sliced GCode after here