Voron purge blob.gcode

# In order to use this you need to increase max_extrude_cross_section in your extruder config or klipper will complain. I set mine to 30
[gcode_macro PURGE_BLOB]
gcode:
    # This is for a 300mm bed. If you have a diferent bed size you may want to adjust the line below
    {% set rand_pos = (105 + ( printer.system_stats.cputime * 1000 ) % 60) %}           ; Generate pseudo random start pos so we dont wear out that one spot on the bed. 
    M117 Purging at X{ rand_pos }                                                       
    
    # The start pos will be within the "handle" of the flex plate where there is some extra Y space available so we can go all the way to Y0
    # If your setup does not have this extra space then just increase the y valie in the line "G1 X{ rand_pos } Y0 Z1 F18000"
    G92 E0                          ; zero the extruder
    G90                             ; absolute positioning
    G1 X{ rand_pos } Y0 Z1 F18000   ; Go to start pos for perge line
    G1 Z0.4 F600                    ; Lower to purge height
    G91                             ; relative positioning
    G1 X5 E40 F40                   ; Extrude blob of filament on the bed
    M106 P0                         ; Enable Cooling Fan
    G1 X20 Z5 F100                  ; Slow drag away from the blob with fans helping cool and break strings. Also raiz z zo the blob clears the fan duct
    G1 X5  Z-5.1 F9000              ; Now that the blob has cleared the duct we go back down for a short 0.3mm height extrusion
    G1 X5 E2 F180                   ; Slow 5mm extrude move to help with stringing
    G1 X30 E-1 F6000                ; Fast move and retract to break strings and reduce ooze
    G1 Z1 F100                      ; Lift
    M106 P0 S0                      ; Disable Cooling Fan
    G92 E0                          ; zero the extruder
    G90                             ; absolute positioning