; Pefix G-Code for Creality CR-10 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 S200   		   ; 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 E100 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-6 F500                     ; Retract filiment by 3 mm to reduce string effect
G1 X3 Y290 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
;
; Ensure extruder is not reset by other code or it will be 3mm short [see next line also]
;G1 E6 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