M200 implementation

Marlin/Marlin.h

 extern bool axis_relative_modes[];
 extern int feedmultiply;
 extern int extrudemultiply; // Sets extrude multiply factor (in percent)
+extern float filament_area[EXTRUDERS]; // cross-sectional area of filament (in cubic millimeters)
 extern float current_position[NUM_AXIS] ;
 extern float add_homeing[3];
 #ifdef DELTA

Marlin/Marlin_main.cpp

 int feedmultiply=100; //100->1 200->2
 int saved_feedmultiply;
 int extrudemultiply=100; //100->1 200->2
+float filament_area[EXTRUDERS] = {1.0
+  #if EXTRUDERS > 1
+    , 1.0
+    #if EXTRUDERS > 2
+      , 1.0
+    #endif
+  #endif
+};
 float current_position[NUM_AXIS] = { 0.0, 0.0, 0.0, 0.0 };
 float add_homeing[3]={0,0,0};
 #ifdef DELTA
       }
       break;
     #endif //BLINKM
+    case 200: // M200 S<millimeters> set filament diameter and set E axis units to cubic millimeters (use S0 to set back to millimeters).
+      {
+        float area;
+        if(code_seen('S')) {
+          float radius = code_value() / 2;
+          if(radius == 0) {
+            area = 1;
+          } else {
+            area = M_PI * pow(radius, 2);
+          }
+        } else {
+          //reserved for setting filament diameter via UFID or filament measuring device
+          break;
+        }
+        tmp_extruder = active_extruder;
+        if(code_seen('T')) {
+          tmp_extruder = code_value();
+          if(tmp_extruder >= EXTRUDERS) {
+            SERIAL_ECHO_START;
+            SERIAL_ECHO(MSG_M200_INVALID_EXTRUDER);
+          }
+          SERIAL_ECHOLN(tmp_extruder);
+          break;
+        }
+        filament_area[tmp_extruder] = area;
+      }
+      break;
     case 201: // M201
       for(int8_t i=0; i < NUM_AXIS; i++)
       {

Marlin/language.h

 	#define MSG_END_FILE_LIST "End file list"
 	#define MSG_M104_INVALID_EXTRUDER "M104 Invalid extruder "
 	#define MSG_M105_INVALID_EXTRUDER "M105 Invalid extruder "
+	#define MSG_M200_INVALID_EXTRUDER "M200 Invalid extruder "
 	#define MSG_M218_INVALID_EXTRUDER "M218 Invalid extruder "
 	#define MSG_ERR_NO_THERMISTORS "No thermistors - no temperature"
 	#define MSG_M109_INVALID_EXTRUDER "M109 Invalid extruder "
 	#define MSG_END_FILE_LIST "Koniec listy plikow"
 	#define MSG_M104_INVALID_EXTRUDER "M104 Niepoprawny ekstruder "
 	#define MSG_M105_INVALID_EXTRUDER "M105 Niepoprawny ekstruder "
+	#define MSG_M200_INVALID_EXTRUDER "M200 Niepoprawny ekstruder "
 	#define MSG_M218_INVALID_EXTRUDER "M218 Niepoprawny ekstruder "
 	#define MSG_ERR_NO_THERMISTORS "Brak termistorow - brak temperatury :("
 	#define MSG_M109_INVALID_EXTRUDER "M109 Niepoprawny ekstruder "
 	#define MSG_END_FILE_LIST "Fin de la liste de fichiers"
 	#define MSG_M104_INVALID_EXTRUDER "M104 Extruder invalide"
 	#define MSG_M105_INVALID_EXTRUDER "M105 Extruder invalide"
+	#define MSG_M200_INVALID_EXTRUDER "M200 Extruder invalide"
 	#define MSG_M218_INVALID_EXTRUDER "M218 Extruder invalide"
 	#define MSG_ERR_NO_THERMISTORS "Pas de thermistor, pas de temperature"
 	#define MSG_M109_INVALID_EXTRUDER "M109 Extruder invalide "
 	#define MSG_END_FILE_LIST "End file list"
 	#define MSG_M104_INVALID_EXTRUDER "M104 Invalid extruder "
 	#define MSG_M105_INVALID_EXTRUDER "M105 Invalid extruder "
+	#define MSG_M200_INVALID_EXTRUDER "M200 Invalid extruder "
 	#define MSG_M218_INVALID_EXTRUDER "M218 Invalid extruder "
 	#define MSG_ERR_NO_THERMISTORS "No thermistors - no temp"
 	#define MSG_M109_INVALID_EXTRUDER "M109 Invalid extruder "
 	#define MSG_END_FILE_LIST "Fin de la lista de archivos"
 	#define MSG_M104_INVALID_EXTRUDER "M104 Extrusor Invalido "
 	#define MSG_M105_INVALID_EXTRUDER "M105 Extrusor Invalido "
+	#define MSG_M200_INVALID_EXTRUDER "M200 Extrusor Invalido "
 	#define MSG_M218_INVALID_EXTRUDER "M218 Extrusor Invalido "
 	#define MSG_ERR_NO_THERMISTORS "No hay termistores - no temp"
 	#define MSG_M109_INVALID_EXTRUDER "M109 Extrusor Invalido "
 	#define MSG_END_FILE_LIST					"Конец списка файлов"
 	#define MSG_M104_INVALID_EXTRUDER			"M104 ошибка экструдера "
 	#define MSG_M105_INVALID_EXTRUDER			"M105 ошибка экструдера "
+	#define MSG_M200_INVALID_EXTRUDER			"M200 ошибка экструдера "
 	#define MSG_M218_INVALID_EXTRUDER			"M218 ошибка экструдера "
 	#define MSG_ERR_NO_THERMISTORS				"Нет термистра - нет температуры"
 	#define MSG_M109_INVALID_EXTRUDER			"M109 ошибка экструдера "
 	#define MSG_END_FILE_LIST        "Fine Lista File"
 	#define MSG_M104_INVALID_EXTRUDER "M104 Estrusore non valido "
 	#define MSG_M105_INVALID_EXTRUDER "M105 Estrusore non valido "
+	#define MSG_M200_INVALID_EXTRUDER "M200 Estrusore non valido "
 	#define MSG_M218_INVALID_EXTRUDER "M218 Estrusore non valido "
 	#define MSG_ERR_NO_THERMISTORS   "Nessun Termistore - nessuna temperatura"
 	#define MSG_M109_INVALID_EXTRUDER "M109 Estrusore non valido "
 	#define MSG_END_FILE_LIST "Fim da lista de arquivos"
 	#define MSG_M104_INVALID_EXTRUDER "M104 Extrusor inválido "
 	#define MSG_M105_INVALID_EXTRUDER "M105 Extrusor inválido "
+	#define MSG_M200_INVALID_EXTRUDER "M200 Extrusor inválido "
 	#define MSG_M218_INVALID_EXTRUDER "M218 Extrusor inválido "
 	#define MSG_ERR_NO_THERMISTORS "Nao ha termistor - no temp"
 	#define MSG_M109_INVALID_EXTRUDER "M109 Extrusor inválido "
 	#define MSG_END_FILE_LIST "Tiedostolistauksen loppu"
 	#define MSG_M104_INVALID_EXTRUDER "M104 Virheellinen suutin "
 	#define MSG_M105_INVALID_EXTRUDER "M105 Virheellinen suutin "
+	#define MSG_M200_INVALID_EXTRUDER "M200 Virheellinen suutin "
 	#define MSG_M218_INVALID_EXTRUDER "M218 Virheellinen suutin "
 	#define MSG_ERR_NO_THERMISTORS "Ei termistoreja - ei lampotiloja"
 	#define MSG_M109_INVALID_EXTRUDER "M109 Virheellinen suutin "

Marlin/planner.cpp

 #endif
   block->steps_z = labs(target[Z_AXIS]-position[Z_AXIS]);
   block->steps_e = labs(target[E_AXIS]-position[E_AXIS]);
+  block->steps_e *= filament_area[active_extruder];
   block->steps_e *= extrudemultiply;
   block->steps_e /= 100;
   block->step_event_count = max(block->steps_x, max(block->steps_y, max(block->steps_z, block->steps_e)));
     delta_mm[Y_AXIS] = ((target[X_AXIS]-position[X_AXIS]) - (target[Y_AXIS]-position[Y_AXIS]))/axis_steps_per_unit[Y_AXIS];
   #endif
   delta_mm[Z_AXIS] = (target[Z_AXIS]-position[Z_AXIS])/axis_steps_per_unit[Z_AXIS];
-  delta_mm[E_AXIS] = ((target[E_AXIS]-position[E_AXIS])/axis_steps_per_unit[E_AXIS])*extrudemultiply/100.0;
+  delta_mm[E_AXIS] = ((target[E_AXIS]-position[E_AXIS])/axis_steps_per_unit[E_AXIS])*filament_area[active_extruder]*extrudemultiply/100.0;
   if ( block->steps_x <=dropsegments && block->steps_y <=dropsegments && block->steps_z <=dropsegments )
   {
     block->millimeters = fabs(delta_mm[E_AXIS]);