diff --git a/printer_data/config/CUSTOM/set_material.cfg b/printer_data/config/CUSTOM/set_material.cfg
index c60bc09..8e25c0c 100644
--- a/printer_data/config/CUSTOM/set_material.cfg
+++ b/printer_data/config/CUSTOM/set_material.cfg
@@ -492,14 +492,31 @@ variable_pa: 0.04
 #   MAX_FLOW  : Max hotend flow in mm³/s (default: 15)
 #   SMOOTH    : Optional smoothing (default: 0.045)
 
+[gcode_macro SET_PA]
+description: Set Pressure Advance with fully dynamic scaling based on nozzle and flow
+variable_pa: 0.04
+
+# === OVERVIEW ===
+# Fully dynamic Pressure Advance tuning:
+# - Uses nozzle diameter from printer.cfg
+# - Scales PA by nozzle and flow ratio
+# - Automatically sets EXP (flow exponent) as 2x nozzle
+# - Dynamically sets SMOOTH_TIME unless overridden
+#
+# === HOW TO USE ===
+# SET_PA PA=<base_value> [FLOW=<actual_mm3/s>] [MAX_FLOW=<max_mm3/s>] [SMOOTH=<value>] [EXP=<value>]
+#
+# Example:
+#   SET_PA PA=0.05 FLOW=30 MAX_FLOW=70
+#   SET_PA PA=0.05     ; uses defaults (FLOW=10, MAX_FLOW=15)
+
 gcode:
     {% set base_pa   = params.PA|float %}
-    {% set smooth    = params.SMOOTH|default(0.045)|float %}
+    {% set flow      = params.FLOW|default(10.0)|float %}
+    {% set max_flow  = params.MAX_FLOW|default(15.0)|float %}
     {% set nozzle    = printer.extruder.nozzle_diameter|float %}
-    {% set flow      = params.FLOW|default(30.0)|float %}
-    {% set max_flow  = params.MAX_FLOW|default(70.0)|float %}
 
-    # === Nozzle-based scaling ===
+    # === Scale PA based on nozzle diameter ===
     {% if nozzle <= 0.2 %}
         {% set nozzle_scale = 1.8 %}
     {% elif nozzle <= 0.3 %}
@@ -513,29 +530,45 @@ gcode:
     {% else %}
         {% set nozzle_scale = 0.4 %}
     {% endif %}
-
     {% set scaled_pa = base_pa * nozzle_scale %}
 
-    # === Flow-based scaling (square root of flow ratio) ===
-    {% if max_flow > 0 %}
-        {% set flow_ratio = flow / max_flow %}
-        {% set flow_scale = flow_ratio ** 0.5 %}
-        {% set adjusted_pa = scaled_pa * flow_scale %}
+    # === Calculate exponent from nozzle size unless overridden ===
+    {% set exp = params.EXP|default(2.0 * nozzle)|float %}
+
+    # === Flow ratio and flow scale ===
+    {% set flow_ratio = flow / max_flow %}
+    {% set flow_scale = flow_ratio ** exp %}
+    {% set adjusted_pa = scaled_pa * flow_scale %}
+
+    # === Dynamic smoothing time unless overridden ===
+    {% if 'SMOOTH' in params %}
+        {% set smooth = params.SMOOTH|float %}
+        {% set smooth_source = "manual" %}
     {% else %}
-        {% set adjusted_pa = scaled_pa %}
+        {% if nozzle <= 0.3 %}
+            {% set smooth = 0.03 %}
+        {% elif nozzle <= 0.4 %}
+            {% set smooth = 0.04 %}
+        {% elif nozzle <= 0.6 %}
+            {% set smooth = 0.045 %}
+        {% elif nozzle <= 0.8 %}
+            {% set smooth = 0.055 %}
+        {% else %}
+            {% set smooth = 0.065 %}
+        {% endif %}
+        {% set smooth_source = "dynamic" %}
     {% endif %}
 
-    # === Set PA and store variable ===
+    # === Set and store final values ===
     SET_PRESSURE_ADVANCE ADVANCE={adjusted_pa} SMOOTH_TIME={smooth}
     SET_GCODE_VARIABLE MACRO=SET_PA VARIABLE=pa VALUE={adjusted_pa}
 
-    # === Output status ===
-    {% set msg = "📐 PA scaled for nozzle " ~ nozzle|string ~ "mm | Base: " ~ base_pa|string ~
-                 " ➜ x" ~ nozzle_scale|string ~ " (nozzle) ➜ x" ~ flow_scale|string ~ " (flow) = " ~ adjusted_pa|string ~
-                 " | Smooth: " ~ smooth|string %}
+    # === Logging ===
+    {% set msg = "📐 PA scaled | Nozzle: " ~ nozzle|string ~ "mm | Base: " ~ base_pa|string ~ " ➜ x" ~ nozzle_scale|string ~ " ➜ x" ~ flow_scale|string ~ " (flow^" ~ exp|string ~ ") = " ~ adjusted_pa|string ~ " | Smooth: " ~ smooth|string ~ " (" ~ smooth_source ~ ")" %}
     RESPOND MSG="{msg}"
 
 
+
 [gcode_macro SET_CHAMBER_HEAT]
 description: Modular chamber heating logic with active/passive support, includes safety checks and debug output