printer.cfg modified - 07.09.2026 - 19:56:45

printer_data/config/printer.cfg

@@ -665,24 +665,82 @@ gcode:
     STATUS_PRINTING
 
 [gcode_macro LINE_PURGE]
-description: Fixed front purge line that stays below Klipper's extrusion safety limit
+description: Adaptive purge outside the print; safely skips when no free edge exists
 gcode:
+    {% set objects = printer.exclude_object.objects %}
+    {% set points = objects | map(attribute='polygon') | sum(start=[]) %}
+    {% set line_length = 100.0 %}
+    {% set wipe_length = 5.0 %}
+    {% set clearance = 8.0 %}
+    {% set x_offset = printer.configfile.settings.cartographer.x_offset|float %}
+    {% set y_offset = printer.configfile.settings.cartographer.y_offset|float %}
+    # Both nozzle and protruding Cartographer must remain at least 5 mm inside
+    # the 250 mm plate. The rear limit also avoids the brush at nozzle Y=250.5.
+    {% set safe_x_min = [printer.toolhead.axis_minimum.x|float + 5.0, 5.0 - x_offset]|max %}
+    {% set safe_x_max = [printer.toolhead.axis_maximum.x|float - 5.0, 245.0 - x_offset]|min %}
+    {% set safe_y_min = [printer.toolhead.axis_minimum.y|float + 5.0, 5.0 - y_offset]|max %}
+    {% set safe_y_max = [printer.toolhead.axis_maximum.y|float - 5.0, 245.0 - y_offset]|min %}
+
     {% if "xyz" not in printer.toolhead.homed_axes %}
         { action_raise_error("LINE_PURGE requires homed X, Y and Z") }
     {% elif not printer.extruder.can_extrude %}
         { action_raise_error("LINE_PURGE requires a hot extruder") }
+    {% elif points|length == 0 %}
+        { action_respond_info("LINE_PURGE skipped: slicer supplied no object polygons") }
+    {% elif safe_x_max - safe_x_min < line_length + wipe_length or safe_y_max - safe_y_min < line_length + wipe_length %}
+        { action_respond_info("LINE_PURGE skipped: configured safe area is too small") }
     {% else %}
+        {% set object_x_min = points | map(attribute=0) | min | float %}
+        {% set object_x_max = points | map(attribute=0) | max | float %}
+        {% set object_y_min = points | map(attribute=1) | min | float %}
+        {% set object_y_max = points | map(attribute=1) | max | float %}
+        {% set front_gap = object_y_min - safe_y_min %}
+        {% set left_gap = object_x_min - safe_x_min %}
+        {% set right_gap = safe_x_max - object_x_max %}
+        {% set rear_gap = safe_y_max - object_y_max %}
+        {% set largest_gap = [front_gap, left_gap, right_gap, rear_gap]|max %}
+        {% set x_center = (object_x_min + object_x_max) / 2.0 %}
+        {% set y_center = (object_y_min + object_y_max) / 2.0 %}
+        {% set purge_x = [[x_center - line_length / 2.0, safe_x_min]|max, safe_x_max - line_length - wipe_length]|min %}
+        {% set purge_y = [[y_center - line_length / 2.0, safe_y_min]|max, safe_y_max - line_length - wipe_length]|min %}
+
+        {% if largest_gap < clearance %}
+            { action_respond_info("LINE_PURGE skipped: print occupies every safe bed edge") }
+        {% else %}
         # 12 mm of 1.75 mm filament over 100 mm = about 0.289 mm2,
         # safely below max_extrude_cross_section=0.64 mm2 for the 0.4 mm nozzle.
         SAVE_GCODE_STATE NAME=LINE_PURGE_STATE
         G90
         M83
-        G0 X30 Y10 Z2 F12000
+        {% if largest_gap == front_gap %}
-        G0 Z0.4 F600
+            {% set edge = "front" %}
-        G1 X130 E12 F600
+            G0 X{purge_x} Y{object_y_min - clearance} Z2 F12000
-        G1 X135 F1800
+            G0 Z0.4 F600
+            G1 X{purge_x + line_length} E12 F600
+            G1 X{purge_x + line_length + wipe_length} F1800
+        {% elif largest_gap == left_gap %}
+            {% set edge = "left" %}
+            G0 X{object_x_min - clearance} Y{purge_y} Z2 F12000
+            G0 Z0.4 F600
+            G1 Y{purge_y + line_length} E12 F600
+            G1 Y{purge_y + line_length + wipe_length} F1800
+        {% elif largest_gap == right_gap %}
+            {% set edge = "right" %}
+            G0 X{object_x_max + clearance} Y{purge_y} Z2 F12000
+            G0 Z0.4 F600
+            G1 Y{purge_y + line_length} E12 F600
+            G1 Y{purge_y + line_length + wipe_length} F1800
+        {% else %}
+            {% set edge = "rear" %}
+            G0 X{purge_x} Y{object_y_max + clearance} Z2 F12000
+            G0 Z0.4 F600
+            G1 X{purge_x + line_length} E12 F600
+            G1 X{purge_x + line_length + wipe_length} F1800
+        {% endif %}
         G0 Z2 F600
         RESTORE_GCODE_STATE NAME=LINE_PURGE_STATE MOVE=0
+        { action_respond_info("LINE_PURGE used the %s free edge with 8 mm object clearance" % edge) }
+        {% endif %}
     {% endif %}
 
 [gcode_macro _PRINT_CLEANUP]