endprint and startprint retract-unretract is now parametric (#642)

Author: tehniemer

macros/base/cancel_print.cfg

@@ -14,7 +14,8 @@ gcode:
     {% set filament_sensor_enabled = printer["gcode_macro _USER_VARIABLES"].filament_sensor_enabled %}
     {% set filter_default_time = printer["gcode_macro _USER_VARIABLES"].filter_default_time_on_end_print|default(600)|int %}
     {% set hotend_fan_tach_enabled = printer["gcode_macro _USER_VARIABLES"].hotend_fan_tach_enabled %}
-
+    {% set retract_length = printer["gcode_macro _USER_VARIABLES"].retract_length|default(20)|float %}
+    
     PARK
 
     {% if klippain_mmu_enabled and mmu_unload_on_cancel_print %}
@@ -25,7 +26,7 @@ gcode:
     {% elif printer.extruder.can_extrude %}
         # Pull back the filament a little bit
         G92 E0
-        G1 E-10 F2100
+        G1 E-{retract_length} F2100
     {% endif %}
 
     {% if turn_off_heaters_in_end_print %}

macros/base/end_print.cfg

@@ -14,6 +14,7 @@ gcode:
     {% set filter_default_time = printer["gcode_macro _USER_VARIABLES"].filter_default_time_on_end_print|default(600)|int %}
     {% set filament_sensor_enabled = printer["gcode_macro _USER_VARIABLES"].filament_sensor_enabled %}
     {% set hotend_fan_tach_enabled = printer["gcode_macro _USER_VARIABLES"].hotend_fan_tach_enabled %}
+    {% set retract_length = printer["gcode_macro _USER_VARIABLES"].retract_length|default(20)|float %}
 
     PARK
 
@@ -25,7 +26,7 @@ gcode:
     {% elif printer.extruder.can_extrude %}
         # pull back the filament a little bit
         G92 E0
-        G1 E-10 F2100
+        G1 E-{retract_length} F2100
     {% endif %}
 
     {% if turn_off_heaters_in_end_print %}

macros/helpers/nozzle_cleaning.cfg

@@ -81,6 +81,7 @@ gcode:
     {% set OOZE_TIME = params.OOZE_TIME|default(printer["gcode_macro _USER_VARIABLES"].purge_ooze_time)|int %}
     {% set TEMP = params.TEMP|default(printer["gcode_macro _USER_VARIABLES"].print_default_extruder_temp)|float %}
     {% set Z_DROP = params.Z_DROP|default(1)|int %}
+    {% set RETRACT = params.RETRACT|default(printer["gcode_macro _USER_VARIABLES"].retract_length)|default(20)|float %}
 
     {% set purge_and_brush_enabled = printer["gcode_macro _USER_VARIABLES"].purge_and_brush_enabled %}
     {% set purgeclean_servo_enabled = printer["gcode_macro _USER_VARIABLES"].purgeclean_servo_enabled %}
@@ -119,8 +120,8 @@ gcode:
 
         # Retract
         G92 E0
-        G1 E-1.7 F2100
-        G1 E-18.3 F150
+        G1 E-{RETRACT*0.1} F2100
+        G1 E-({RETRACT}-{RETRACT*0.1}) F150
         G92 E0
 
         # Wait some time to let the nozzle ooze before cleaning

macros/helpers/prime_line.cfg

@@ -7,6 +7,7 @@ gcode:
     {% set prime_line_height = params.LINE_HEIGHT|default(printer["gcode_macro _USER_VARIABLES"].prime_line_height)|default(0.6)|float %}
     {% set prime_line_adaptive = params.ADAPTIVE_MODE|default(1)|int %}
     {% set prime_line_margin = params.LINE_MARGIN|default(printer["gcode_macro _USER_VARIABLES"].prime_line_margin)|default(5.0)|float %} # Used only in adaptive mode
+    {% set prime_line_unretract_length = printer["gcode_macro _USER_VARIABLES"].unretract_length|default(23)|float %}
     {% set prime_line_wipe = printer["gcode_macro _USER_VARIABLES"].prime_line_wipe|default(False) %}
     {% set prime_line_wipe_length = prime_line_length * 0.8 %}
 
@@ -112,7 +113,7 @@ gcode:
 
     # Add pressure in the nozzle
     G92 E0
-    G1 E18 F300
+    G1 E{prime_line_unretract_length} F300
 
     # Prime line
     G92 E0

user_templates/variables.cfg

@@ -61,6 +61,13 @@ variable_prime_line_height: 0.6 # mm, used for actual cross section computation
 variable_prime_line_margin: 5  # distance of purge line from fl_size rectangle
 variable_prime_line_wipe: False # enable a wipe of the nozzle after completing the prime line
 
+## Length of filament to retract to disengage it from the heatbreak.
+## This is to reduce final print oozing, but also to prevent heatcreep, clogging, and allow cold filament change between prints.
+## Unretract is the length of filament to prime and pressurize the nozzle prior to printing. 
+## This is recommended to be 10-20% more than the retract value.
+variable_retract_length: 20
+variable_unretract_length: 23
+
 ## Park position used when pause, end_print, etc...
 variable_park_position_xy: -1, -1
 variable_park_lift_z: 50