Use cs.volumetric_enabled from ConfigurationStore.

Firmware/ConfigurationStore.cpp

@@ -144,7 +144,7 @@ void Config_PrintSettings(uint8_t level)
 	printf_P(PSTR("%SMulti-extruder settings:\n%S   Swap retract length (mm):    %.2f\n%S   Swap rec. addl. length (mm): %.2f\n"),
 		echomagic, echomagic, retract_length_swap, echomagic, retract_recover_length_swap);
 #endif
-	if (volumetric_enabled) {
+	if (cs.volumetric_enabled) {
 		printf_P(PSTR("%SFilament settings:\n%S   M200 D%.2f\n"),
 			echomagic, echomagic, filament_size[0]);
 #if EXTRUDERS > 1

Firmware/Marlin.h

@@ -269,7 +269,6 @@ extern float homing_feedrate[];
 extern bool axis_relative_modes[];
 extern int feedmultiply;
 extern int extrudemultiply; // Sets extrude multiply factor (in percent) for all extruders
-extern bool volumetric_enabled;
 extern int extruder_multiply[EXTRUDERS]; // sets extrude multiply factor (in percent) for each extruder individually
 extern float filament_size[EXTRUDERS]; // cross-sectional area of filament (in millimeters), typically around 1.75 or 2.85, 0 disables the volumetric calculations for the extruder.
 extern float volumetric_multiplier[EXTRUDERS]; // reciprocal of cross-sectional area of filament (in square millimeters), stored this way to reduce computational burden in planner

Firmware/Marlin_main.cpp

@@ -368,7 +368,6 @@ char dir_names[3][9];
 
 bool sortAlpha = false;
 
-bool volumetric_enabled = false;
 float filament_size[EXTRUDERS] = { DEFAULT_NOMINAL_FILAMENT_DIA
   #if EXTRUDERS > 1
       , DEFAULT_NOMINAL_FILAMENT_DIA
@@ -5847,7 +5846,7 @@ Sigma_Exit:
 			// setting any extruder filament size disables volumetric on the assumption that
 			// slicers either generate in extruder values as cubic mm or as as filament feeds
 			// for all extruders
-		    volumetric_enabled = false;
+		    cs.volumetric_enabled = false;
 		  } else {
             filament_size[extruder] = (float)code_value();
 			// make sure all extruders have some sane value for the filament size
@@ -5858,7 +5857,7 @@ Sigma_Exit:
 			filament_size[2] = (filament_size[2] == 0.0 ? DEFAULT_NOMINAL_FILAMENT_DIA : filament_size[2]);
             #endif
             #endif
-			volumetric_enabled = true;
+			cs.volumetric_enabled = true;
 		  }
         } else {
           //reserved for setting filament diameter via UFID or filament measuring device
@@ -7646,7 +7645,7 @@ void save_statistics(unsigned long _total_filament_used, unsigned long _total_pr
 
 float calculate_extruder_multiplier(float diameter) {
   float out = 1.f;
-  if (volumetric_enabled && diameter > 0.f) {
+  if (cs.volumetric_enabled && diameter > 0.f) {
     float area = M_PI * diameter * diameter * 0.25;
     out = 1.f / area;
   }