m106_adjust.cfg modified - 18/04/25 - 09:39:30

printer_data/config/CUSTOM/m106_adjust.cfg

@@ -0,0 +1,53 @@
+[gcode_macro M106]
+rename_existing: G106
+description: Compresses fan speeds into 10–30% range if bed temp ≥ 70°C
+
+# === OVERVIEW ===
+# This macro overrides the default M106 behavior to apply a thermal-aware fan speed limiter.
+# When the bed temperature is at or above 70°C, it compresses the part cooling fan speed range
+# into a safer 10–30% range (i.e., 26–76 PWM) to reduce warping or delamination in high-temp materials.
+#
+# === WHY USE THIS ===
+# - Prevents excessive part cooling when printing materials like ABS, ASA, or PC.
+# - Helps maintain stable chamber temperatures and reduce thermal shock.
+# - Minimizes curling or layer splitting due to sudden cooling on hot beds.
+#
+# === HOW TO USE ===
+# Simply use M106 S<value> as usual in your G-code or slicer.
+# The macro will automatically adjust the fan speed if needed based on bed temperature.
+#
+# === NOTES ===
+# - This logic only applies when the bed temperature is 70°C or higher.
+# - Below 70°C, full-range fan control is allowed.
+# - You can customize the input/output compression range if needed.
+
+# === PARAMETERS ===
+#   S: Standard fan speed in 0–255 (required by M106)
+
+# Internal constants:
+#   min_input  = 26  (10% of 255)
+#   max_input  = 255 (100%)
+#   min_output = 26  (10%)
+#   max_output = 76  (30%)
+
+gcode:
+    {% set fan_speed = params.S|default(0)|int %}
+    {% set bed_temp = printer["heater_bed"].temperature %}
+    {% set min_input = 26 %}
+    {% set max_input = 255 %}
+    {% set min_output = 26 %}
+    {% set max_output = 76 %}
+
+    {% if bed_temp >= 70 %}
+        # If below threshold, limit fan to the lower compressed range (10–30%)
+        {% if fan_speed < min_input %}
+            {% set compressed_speed = min_output %}
+        {% else %}
+            {% set compressed_speed = (min_output + ((fan_speed - min_input) * (max_output - min_output) / (max_input - min_input)))|int %}
+        {% endif %}
+        G106 S{compressed_speed}
+    {% else %}
+        # Below threshold, allow full fan speed as requested
+        G106 S{fan_speed}
+    {% endif %}
+