fix: make prime line height a variable parameter

* Fix #465
Frix-x · Feb 10, 2024 · 623b96e · 623b96e
1 parent a1e7214
commit 623b96e
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Showing 2 changed files with 14 additions and 8 deletions.
diff --git a/macros/helpers/prime_line.cfg b/macros/helpers/prime_line.cfg
@@ -4,6 +4,7 @@ gcode:
     {% set prime_line_length = params.LINE_LENGTH|default(printer["gcode_macro _USER_VARIABLES"].prime_line_length)|float %}
     {% set prime_line_purge_distance = params.PURGE_LENGTH|default(printer["gcode_macro _USER_VARIABLES"].prime_line_purge_distance)|float %}
     {% set prime_line_flowrate = params.FLOWRATE|default(printer["gcode_macro _USER_VARIABLES"].prime_line_flowrate)|float %}
+    {% set prime_line_height = params.LINE_HEIGHT|default(printer["gcode_macro _USER_VARIABLES"].prime_line_height)|float %}
 
     # Set internal macro vars
     {% set prime_line_x, prime_line_y = printer["gcode_macro _USER_VARIABLES"].prime_line_xy|map('float') %}
@@ -19,40 +20,44 @@ gcode:
     {% set max_extrude_cross_section = printer["configfile"].config["extruder"]["max_extrude_cross_section"]|float %}
     {% set filament_diameter = printer["configfile"].config["extruder"]["filament_diameter"]|float %}
 
-    {% set line_height = 0.6 %}
-
     # some more Macro parameters after retrieving defaults
     {% set prime_line_x = params.START_X|default(prime_line_x)|float %}
     {% set prime_line_y = params.START_Y|default(prime_line_y)|float %}
     {% set prime_line_direction = params.LINE_DIRECTION|default(printer["gcode_macro _USER_VARIABLES"].prime_line_direction)|string|upper %}
 
+    {% if verbose %}
+        {action_respond_info("Prime line length: %.4f" % prime_line_length)}
+        {action_respond_info("Prime line eight: %.4f" % prime_line_height)}
+        {action_respond_info("prime line extrusion length: %4.f" % prime_line_purge_distance)}
+    {% endif %} 
+
     # We first compute the width of the prime line
     {% set purge_volume = prime_line_purge_distance * 3.14159 * (filament_diameter / 2)**2 %}
-    {% set line_width = purge_volume / (line_height * prime_line_length) %}
+    {% set line_width = purge_volume / (prime_line_height * prime_line_length) %}
 
     # Then we check that the prime line cross section will not be problematic (exceeding Klipper max_extrude_cross_section)
     # or, if it's the case, we warn the user and add a correction to the length of filament to be purged
-    {% if (line_height * line_width) > max_extrude_cross_section %}
+    {% if (prime_line_height * line_width) > max_extrude_cross_section %}
         {% if verbose %}
             {action_respond_info("The prime_line_purge_distance of %.4f mm is too high and will exceed the max_extrude_cross_section!" % prime_line_purge_distance)}
         {% endif %}
         {% set prime_line_purge_distance = 0.98 * (max_extrude_cross_section * prime_line_length) / (3.14159 * (filament_diameter / 2)**2) %}
         {% set purge_volume = prime_line_purge_distance * 3.14159 * (filament_diameter / 2)**2 %}
-        {% set line_width = purge_volume / (line_height * prime_line_length) %}
+        {% set line_width = purge_volume / (prime_line_height * prime_line_length) %}
         {% if verbose %}
             {action_respond_info("Klippain corrected the prime_line_purge_distance to %.4f mm" % prime_line_purge_distance)}
         {% endif %}
     {% endif %}
 
     # We then compute the height to width ratio and validate that the prime line will not be too thin
-    {% if (line_height / line_width) >= 0.5 %} # TODO: validate this 1/2 ratio is good for all
+    {% if (prime_line_height / line_width) >= 0.5 %} # TODO: validate this 1/2 ratio is good for all
         {% if verbose %}
             {action_raise_error("The prime line will be too thin and will probably not stick properly to the bed. Increase its purge distance or decrease its length! Aborting...")}
         {% endif %}
     {% endif %}
 
     # Finally we compute the speed to get the correct flowrate for the prime line
-    {% set speed = (prime_line_flowrate / (line_height * line_width)) * 60 |float %}
+    {% set speed = (prime_line_flowrate / (prime_line_height * line_width)) * 60 |float %}
 
     {% if klippain_ercf_enabled %}
         {% if printer.ercf.enabled %}
@@ -78,7 +83,7 @@ gcode:
     # Starting position
     G90
     G0 X{prime_line_x} Y{prime_line_y} F{St}
-    G1 Z{line_height} F{Sz|int / 2}
+    G1 Z{prime_line_height} F{Sz|int / 2}
 
     # Add pressure in the nozzle
     G92 E0

diff --git a/user_templates/variables.cfg b/user_templates/variables.cfg
@@ -60,6 +60,7 @@ variable_prime_line_direction: "X" # can also be set to "Y"
 variable_prime_line_length: 40 # length of the prime line on the bed (in mm)
 variable_prime_line_purge_distance: 30 # length of filament to purge (in mm)
 variable_prime_line_flowrate: 10 # mm3/s used for the prime line
+variable_prime_line_height: 0.6 # mm, used for actual cross section computation
 
 ## Park position used when pause, end_print, etc...
 variable_park_position_xy: -1, -1