diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index ba192da4e..18911474c 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -1,30 +1,30 @@
-/* -*- c++ -*- */
-
-/*
-    Reprap firmware based on Sprinter and grbl.
- Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- This firmware is a mashup between Sprinter and grbl.
-  (https://github.com/kliment/Sprinter)
-  (https://github.com/simen/grbl/tree)
-
- It has preliminary support for Matthew Roberts advance algorithm
-    http://reprap.org/pipermail/reprap-dev/2011-May/003323.html
+/**
+ * Marlin Firmware
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * About Marlin
+ *
+ * This firmware is a mashup between Sprinter and grbl.
+ *  - https://github.com/kliment/Sprinter
+ *  - https://github.com/simen/grbl/tree
+ *
+ * It has preliminary support for Matthew Roberts advance algorithm
+ *  - http://reprap.org/pipermail/reprap-dev/2011-May/003323.html
  */
 
 #include "Marlin.h"
@@ -73,13 +73,12 @@
  *  - http://objects.reprap.org/wiki/Mendel_User_Manual:_RepRapGCodes
  *
  * Help us document these G-codes online:
+ *  - http://www.marlinfirmware.org/index.php/G-Code
  *  - http://reprap.org/wiki/G-code
- *  - https://github.com/MarlinFirmware/Marlin/wiki/Marlin-G-Code
- */
-
-/**
+ *
+ * -----------------
  * Implemented Codes
- * -------------------
+ * -----------------
  *
  * "G" Codes
  *
@@ -163,7 +162,7 @@
  * M205 -  advanced settings:  minimum travel speed S=while printing T=travel only,  B=minimum segment time X= maximum xy jerk, Z=maximum Z jerk, E=maximum E jerk
  * M206 - Set additional homing offset
  * M207 - Set retract length S[positive mm] F[feedrate mm/min] Z[additional zlift/hop], stays in mm regardless of M200 setting
- * M208 - Set recover=unretract length S[positive mm surplus to the M207 S*] F[feedrate mm/sec]
+ * M208 - Set recover=unretract length S[positive mm surplus to the M207 S*] F[feedrate mm/min]
  * M209 - S<1=true/0=false> enable automatic retract detect if the slicer did not support G10/11: every normal extrude-only move will be classified as retract depending on the direction.
  * M218 - Set hotend offset (in mm): T<extruder_number> X<offset_on_X> Y<offset_on_Y>
  * M220 - Set speed factor override percentage: S<factor in percent>
@@ -215,6 +214,11 @@
  *
  * M928 - Start SD logging (M928 filename.g) - ended by M29
  * M999 - Restart after being stopped by error
+ *
+ * "T" Codes
+ *
+ * T0-T3 - Select a tool by index (usually an extruder) [ F<mm/min> ]
+ *
  */
 
 #ifdef SDSUPPORT
@@ -557,9 +561,9 @@ void servo_init() {
 
   // Set position of Servo Endstops that are defined
   #ifdef SERVO_ENDSTOPS
-  for (int i = 0; i < 3; i++)
-    if (servo_endstops[i] >= 0)
-      servo[servo_endstops[i]].write(servo_endstop_angles[i * 2 + 1]);
+    for (int i = 0; i < 3; i++)
+      if (servo_endstops[i] >= 0)
+        servo[servo_endstops[i]].write(servo_endstop_angles[i * 2 + 1]);
   #endif
 
   #if SERVO_LEVELING
@@ -993,7 +997,7 @@ XYZ_CONSTS_FROM_CONFIG(signed char, home_dir, HOME_DIR);
 
 #endif //DUAL_X_CARRIAGE
 
-static void axis_is_at_home(int axis) {
+static void axis_is_at_home(AxisEnum axis) {
 
   #ifdef DUAL_X_CARRIAGE
     if (axis == X_AXIS) {
@@ -1198,12 +1202,12 @@ static void setup_for_endstop_move() {
       plan_bed_level_matrix.set_to_identity();
       feedrate = homing_feedrate[Z_AXIS];
 
-      // move down until you find the bed
+      // Move down until the probe (or endstop?) is triggered
       float zPosition = -10;
       line_to_z(zPosition);
       st_synchronize();
 
-      // we have to let the planner know where we are right now as it is not where we said to go.
+      // Tell the planner where we ended up - Get this from the stepper handler
       zPosition = st_get_position_mm(Z_AXIS);
       plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], zPosition, current_position[E_AXIS]);
 
@@ -1313,21 +1317,21 @@ static void setup_for_endstop_move() {
       
       st_synchronize();
 
-    #ifdef Z_PROBE_ENDSTOP
-      bool z_probe_endstop = (READ(Z_PROBE_PIN) != Z_PROBE_ENDSTOP_INVERTING);
-      if (z_probe_endstop)
-    #else
-      bool z_min_endstop = (READ(Z_MIN_PIN) != Z_MIN_ENDSTOP_INVERTING);
-      if (z_min_endstop)
-    #endif
-      {
-        if (IsRunning()) {
-          SERIAL_ERROR_START;
-          SERIAL_ERRORLNPGM("Z-Probe failed to engage!");
-          LCD_ALERTMESSAGEPGM("Err: ZPROBE");
+      #ifdef Z_PROBE_ENDSTOP
+        bool z_probe_endstop = (READ(Z_PROBE_PIN) != Z_PROBE_ENDSTOP_INVERTING);
+        if (z_probe_endstop)
+      #else
+        bool z_min_endstop = (READ(Z_MIN_PIN) != Z_MIN_ENDSTOP_INVERTING);
+        if (z_min_endstop)
+      #endif
+        {
+          if (IsRunning()) {
+            SERIAL_ERROR_START;
+            SERIAL_ERRORLNPGM("Z-Probe failed to engage!");
+            LCD_ALERTMESSAGEPGM("Err: ZPROBE");
+          }
+          Stop();
         }
-        Stop();
-      }
 
     #endif // Z_PROBE_ALLEN_KEY
 
@@ -1390,23 +1394,23 @@ static void setup_for_endstop_move() {
       
       st_synchronize();
 
-    #ifdef Z_PROBE_ENDSTOP
-      bool z_probe_endstop = (READ(Z_PROBE_PIN) != Z_PROBE_ENDSTOP_INVERTING);
-      if (!z_probe_endstop)
-    #else
-      bool z_min_endstop = (READ(Z_MIN_PIN) != Z_MIN_ENDSTOP_INVERTING);
-      if (!z_min_endstop)
-    #endif
-      {
-        if (IsRunning()) {
-          SERIAL_ERROR_START;
-          SERIAL_ERRORLNPGM("Z-Probe failed to retract!");
-          LCD_ALERTMESSAGEPGM("Err: ZPROBE");
+      #ifdef Z_PROBE_ENDSTOP
+        bool z_probe_endstop = (READ(Z_PROBE_PIN) != Z_PROBE_ENDSTOP_INVERTING);
+        if (!z_probe_endstop)
+      #else
+        bool z_min_endstop = (READ(Z_MIN_PIN) != Z_MIN_ENDSTOP_INVERTING);
+        if (!z_min_endstop)
+      #endif
+        {
+          if (IsRunning()) {
+            SERIAL_ERROR_START;
+            SERIAL_ERRORLNPGM("Z-Probe failed to retract!");
+            LCD_ALERTMESSAGEPGM("Err: ZPROBE");
+          }
+          Stop();
         }
-        Stop();
-      }
 
-    #endif
+    #endif // Z_PROBE_ALLEN_KEY
 
   }
 
@@ -1418,32 +1422,31 @@ static void setup_for_endstop_move() {
   };
 
   // Probe bed height at position (x,y), returns the measured z value
-  static float probe_pt(float x, float y, float z_before, ProbeAction retract_action=ProbeDeployAndStow, int verbose_level=1) {
+  static float probe_pt(float x, float y, float z_before, ProbeAction probe_action=ProbeDeployAndStow, int verbose_level=1) {
     // move to right place
     do_blocking_move_to(current_position[X_AXIS], current_position[Y_AXIS], z_before); // this also updates current_position
     do_blocking_move_to(x - X_PROBE_OFFSET_FROM_EXTRUDER, y - Y_PROBE_OFFSET_FROM_EXTRUDER, current_position[Z_AXIS]); // this also updates current_position
 
     #if !defined(Z_PROBE_SLED) && !defined(Z_PROBE_ALLEN_KEY)
-      if (retract_action & ProbeDeploy) deploy_z_probe();
+      if (probe_action & ProbeDeploy) deploy_z_probe();
     #endif
 
     run_z_probe();
     float measured_z = current_position[Z_AXIS];
 
     #if Z_RAISE_BETWEEN_PROBINGS > 0
-      if (retract_action == ProbeStay) {
+      if (probe_action == ProbeStay) {
         do_blocking_move_to(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS] + Z_RAISE_BETWEEN_PROBINGS); // this also updates current_position
         st_synchronize();
       }
     #endif
 
     #if !defined(Z_PROBE_SLED) && !defined(Z_PROBE_ALLEN_KEY)
-      if (retract_action & ProbeStow) stow_z_probe();
+      if (probe_action & ProbeStow) stow_z_probe();
     #endif
 
     if (verbose_level > 2) {
-      SERIAL_PROTOCOLPGM("Bed");
-      SERIAL_PROTOCOLPGM(" X: ");
+      SERIAL_PROTOCOLPGM("Bed X: ");
       SERIAL_PROTOCOL_F(x, 3);
       SERIAL_PROTOCOLPGM(" Y: ");
       SERIAL_PROTOCOL_F(y, 3);
@@ -1593,12 +1596,11 @@ static void homeaxis(AxisEnum axis) {
       if (axis == Z_AXIS) {
         if (axis_home_dir < 0) deploy_z_probe();
       }
-      else
 
     #endif
 
     #ifdef SERVO_ENDSTOPS
-      {
+      if (axis != Z_AXIS) {
         // Engage Servo endstop if enabled
         if (servo_endstops[axis] > -1)
           servo[servo_endstops[axis]].write(servo_endstop_angles[axis * 2]);
@@ -2763,8 +2765,8 @@ inline void gcode_G28() {
               z_tmp = current_position[Z_AXIS],
               real_z = (float)st_get_position(Z_AXIS) / axis_steps_per_unit[Z_AXIS];  //get the real Z (since the auto bed leveling is already correcting the plane)
 
-        apply_rotation_xyz(plan_bed_level_matrix, x_tmp, y_tmp, z_tmp);         //Apply the correction sending the probe offset
-        current_position[Z_AXIS] = z_tmp - real_z + current_position[Z_AXIS];   //The difference is added to current position and sent to planner.
+        apply_rotation_xyz(plan_bed_level_matrix, x_tmp, y_tmp, z_tmp); // Apply the correction sending the probe offset
+        current_position[Z_AXIS] += z_tmp - real_z;                     // The difference is added to current position and sent to planner.
         sync_plan_position();
       }
     #endif // !DELTA
@@ -2792,8 +2794,7 @@ inline void gcode_G28() {
       feedrate = homing_feedrate[Z_AXIS];
 
       run_z_probe();
-      SERIAL_PROTOCOLPGM("Bed");
-      SERIAL_PROTOCOLPGM(" X: ");
+      SERIAL_PROTOCOLPGM("Bed X: ");
       SERIAL_PROTOCOL(current_position[X_AXIS] + 0.0001);
       SERIAL_PROTOCOLPGM(" Y: ");
       SERIAL_PROTOCOL(current_position[Y_AXIS] + 0.0001);
@@ -4624,7 +4625,7 @@ inline void gcode_M400() { st_synchronize(); }
     stow_z_probe(false);
   }
 
-#endif
+#endif // ENABLE_AUTO_BED_LEVELING && (SERVO_ENDSTOPS || Z_PROBE_ALLEN_KEY) && !Z_PROBE_SLED
 
 #ifdef FILAMENT_SENSOR
 
@@ -4819,7 +4820,7 @@ inline void gcode_M503() {
     if (code_seen('Z')) {
       value = code_value();
       if (Z_PROBE_OFFSET_RANGE_MIN <= value && value <= Z_PROBE_OFFSET_RANGE_MAX) {
-        zprobe_zoffset = -value; // compare w/ line 278 of configuration_store.cpp
+        zprobe_zoffset = -value;
         SERIAL_ECHO_START;
         SERIAL_ECHOLNPGM(MSG_ZPROBE_ZOFFSET " " MSG_OK);
         SERIAL_EOL;
@@ -5074,9 +5075,11 @@ inline void gcode_M999() {
 
 /**
  * T0-T3: Switch tool, usually switching extruders
+ *
+ *   F[mm/min] Set the movement feedrate
  */
 inline void gcode_T() {
-  int tmp_extruder = code_value();
+  uint16_t tmp_extruder = code_value_short();
   if (tmp_extruder >= EXTRUDERS) {
     SERIAL_ECHO_START;
     SERIAL_CHAR('T');
@@ -5589,14 +5592,14 @@ void process_next_command() {
         gcode_M400();
         break;
 
-      #if defined(ENABLE_AUTO_BED_LEVELING) && (defined(SERVO_ENDSTOPS) || defined(Z_PROBE_ALLEN_KEY)) && not defined(Z_PROBE_SLED)
+      #if defined(ENABLE_AUTO_BED_LEVELING) && (defined(SERVO_ENDSTOPS) || defined(Z_PROBE_ALLEN_KEY)) && !defined(Z_PROBE_SLED)
         case 401:
           gcode_M401();
           break;
         case 402:
           gcode_M402();
           break;
-      #endif
+      #endif // ENABLE_AUTO_BED_LEVELING && (SERVO_ENDSTOPS || Z_PROBE_ALLEN_KEY) && !Z_PROBE_SLED
 
       #ifdef FILAMENT_SENSOR
         case 404:  //M404 Enter the nominal filament width (3mm, 1.75mm ) N<3.0> or display nominal filament width
@@ -6089,82 +6092,83 @@ void prepare_move() {
 #endif // HAS_CONTROLLERFAN
 
 #ifdef SCARA
-void calculate_SCARA_forward_Transform(float f_scara[3])
-{
-  // Perform forward kinematics, and place results in delta[3]
-  // The maths and first version has been done by QHARLEY . Integrated into masterbranch 06/2014 and slightly restructured by Joachim Cerny in June 2014
-  
-  float x_sin, x_cos, y_sin, y_cos;
-  
+
+  void calculate_SCARA_forward_Transform(float f_scara[3]) {
+    // Perform forward kinematics, and place results in delta[3]
+    // The maths and first version has been done by QHARLEY . Integrated into masterbranch 06/2014 and slightly restructured by Joachim Cerny in June 2014
+
+    float x_sin, x_cos, y_sin, y_cos;
+
     //SERIAL_ECHOPGM("f_delta x="); SERIAL_ECHO(f_scara[X_AXIS]);
     //SERIAL_ECHOPGM(" y="); SERIAL_ECHO(f_scara[Y_AXIS]);
-  
+
     x_sin = sin(f_scara[X_AXIS]/SCARA_RAD2DEG) * Linkage_1;
     x_cos = cos(f_scara[X_AXIS]/SCARA_RAD2DEG) * Linkage_1;
     y_sin = sin(f_scara[Y_AXIS]/SCARA_RAD2DEG) * Linkage_2;
     y_cos = cos(f_scara[Y_AXIS]/SCARA_RAD2DEG) * Linkage_2;
-   
-  //  SERIAL_ECHOPGM(" x_sin="); SERIAL_ECHO(x_sin);
-  //  SERIAL_ECHOPGM(" x_cos="); SERIAL_ECHO(x_cos);
-  //  SERIAL_ECHOPGM(" y_sin="); SERIAL_ECHO(y_sin);
-  //  SERIAL_ECHOPGM(" y_cos="); SERIAL_ECHOLN(y_cos);
-  
+
+    //SERIAL_ECHOPGM(" x_sin="); SERIAL_ECHO(x_sin);
+    //SERIAL_ECHOPGM(" x_cos="); SERIAL_ECHO(x_cos);
+    //SERIAL_ECHOPGM(" y_sin="); SERIAL_ECHO(y_sin);
+    //SERIAL_ECHOPGM(" y_cos="); SERIAL_ECHOLN(y_cos);
+
     delta[X_AXIS] = x_cos + y_cos + SCARA_offset_x;  //theta
     delta[Y_AXIS] = x_sin + y_sin + SCARA_offset_y;  //theta+phi
 
     //SERIAL_ECHOPGM(" delta[X_AXIS]="); SERIAL_ECHO(delta[X_AXIS]);
     //SERIAL_ECHOPGM(" delta[Y_AXIS]="); SERIAL_ECHOLN(delta[Y_AXIS]);
-}  
+  }  
 
-void calculate_delta(float cartesian[3]){
-  //reverse kinematics.
-  // Perform reversed kinematics, and place results in delta[3]
-  // The maths and first version has been done by QHARLEY . Integrated into masterbranch 06/2014 and slightly restructured by Joachim Cerny in June 2014
-  
-  float SCARA_pos[2];
-  static float SCARA_C2, SCARA_S2, SCARA_K1, SCARA_K2, SCARA_theta, SCARA_psi; 
-  
-  SCARA_pos[X_AXIS] = cartesian[X_AXIS] * axis_scaling[X_AXIS] - SCARA_offset_x;  //Translate SCARA to standard X Y
-  SCARA_pos[Y_AXIS] = cartesian[Y_AXIS] * axis_scaling[Y_AXIS] - SCARA_offset_y;  // With scaling factor.
-  
-  #if (Linkage_1 == Linkage_2)
-    SCARA_C2 = ( ( sq(SCARA_pos[X_AXIS]) + sq(SCARA_pos[Y_AXIS]) ) / (2 * (float)L1_2) ) - 1;
-  #else
-    SCARA_C2 =   ( sq(SCARA_pos[X_AXIS]) + sq(SCARA_pos[Y_AXIS]) - (float)L1_2 - (float)L2_2 ) / 45000; 
-  #endif
-  
-  SCARA_S2 = sqrt( 1 - sq(SCARA_C2) );
-  
-  SCARA_K1 = Linkage_1 + Linkage_2 * SCARA_C2;
-  SCARA_K2 = Linkage_2 * SCARA_S2;
-  
-  SCARA_theta = ( atan2(SCARA_pos[X_AXIS],SCARA_pos[Y_AXIS])-atan2(SCARA_K1, SCARA_K2) ) * -1;
-  SCARA_psi   =   atan2(SCARA_S2,SCARA_C2);
-  
-  delta[X_AXIS] = SCARA_theta * SCARA_RAD2DEG;  // Multiply by 180/Pi  -  theta is support arm angle
-  delta[Y_AXIS] = (SCARA_theta + SCARA_psi) * SCARA_RAD2DEG;  //       -  equal to sub arm angle (inverted motor)
-  delta[Z_AXIS] = cartesian[Z_AXIS];
-  
-  /*
-  SERIAL_ECHOPGM("cartesian x="); SERIAL_ECHO(cartesian[X_AXIS]);
-  SERIAL_ECHOPGM(" y="); SERIAL_ECHO(cartesian[Y_AXIS]);
-  SERIAL_ECHOPGM(" z="); SERIAL_ECHOLN(cartesian[Z_AXIS]);
-  
-  SERIAL_ECHOPGM("scara x="); SERIAL_ECHO(SCARA_pos[X_AXIS]);
-  SERIAL_ECHOPGM(" y="); SERIAL_ECHOLN(SCARA_pos[Y_AXIS]);
-  
-  SERIAL_ECHOPGM("delta x="); SERIAL_ECHO(delta[X_AXIS]);
-  SERIAL_ECHOPGM(" y="); SERIAL_ECHO(delta[Y_AXIS]);
-  SERIAL_ECHOPGM(" z="); SERIAL_ECHOLN(delta[Z_AXIS]);
-  
-  SERIAL_ECHOPGM("C2="); SERIAL_ECHO(SCARA_C2);
-  SERIAL_ECHOPGM(" S2="); SERIAL_ECHO(SCARA_S2);
-  SERIAL_ECHOPGM(" Theta="); SERIAL_ECHO(SCARA_theta);
-  SERIAL_ECHOPGM(" Psi="); SERIAL_ECHOLN(SCARA_psi);
-  SERIAL_ECHOLN(" ");*/
-}
+  void calculate_delta(float cartesian[3]){
+    //reverse kinematics.
+    // Perform reversed kinematics, and place results in delta[3]
+    // The maths and first version has been done by QHARLEY . Integrated into masterbranch 06/2014 and slightly restructured by Joachim Cerny in June 2014
+    
+    float SCARA_pos[2];
+    static float SCARA_C2, SCARA_S2, SCARA_K1, SCARA_K2, SCARA_theta, SCARA_psi; 
+    
+    SCARA_pos[X_AXIS] = cartesian[X_AXIS] * axis_scaling[X_AXIS] - SCARA_offset_x;  //Translate SCARA to standard X Y
+    SCARA_pos[Y_AXIS] = cartesian[Y_AXIS] * axis_scaling[Y_AXIS] - SCARA_offset_y;  // With scaling factor.
+    
+    #if (Linkage_1 == Linkage_2)
+      SCARA_C2 = ( ( sq(SCARA_pos[X_AXIS]) + sq(SCARA_pos[Y_AXIS]) ) / (2 * (float)L1_2) ) - 1;
+    #else
+      SCARA_C2 =   ( sq(SCARA_pos[X_AXIS]) + sq(SCARA_pos[Y_AXIS]) - (float)L1_2 - (float)L2_2 ) / 45000; 
+    #endif
+    
+    SCARA_S2 = sqrt( 1 - sq(SCARA_C2) );
+    
+    SCARA_K1 = Linkage_1 + Linkage_2 * SCARA_C2;
+    SCARA_K2 = Linkage_2 * SCARA_S2;
+    
+    SCARA_theta = ( atan2(SCARA_pos[X_AXIS],SCARA_pos[Y_AXIS])-atan2(SCARA_K1, SCARA_K2) ) * -1;
+    SCARA_psi   =   atan2(SCARA_S2,SCARA_C2);
+    
+    delta[X_AXIS] = SCARA_theta * SCARA_RAD2DEG;  // Multiply by 180/Pi  -  theta is support arm angle
+    delta[Y_AXIS] = (SCARA_theta + SCARA_psi) * SCARA_RAD2DEG;  //       -  equal to sub arm angle (inverted motor)
+    delta[Z_AXIS] = cartesian[Z_AXIS];
+    
+    /*
+    SERIAL_ECHOPGM("cartesian x="); SERIAL_ECHO(cartesian[X_AXIS]);
+    SERIAL_ECHOPGM(" y="); SERIAL_ECHO(cartesian[Y_AXIS]);
+    SERIAL_ECHOPGM(" z="); SERIAL_ECHOLN(cartesian[Z_AXIS]);
+    
+    SERIAL_ECHOPGM("scara x="); SERIAL_ECHO(SCARA_pos[X_AXIS]);
+    SERIAL_ECHOPGM(" y="); SERIAL_ECHOLN(SCARA_pos[Y_AXIS]);
+    
+    SERIAL_ECHOPGM("delta x="); SERIAL_ECHO(delta[X_AXIS]);
+    SERIAL_ECHOPGM(" y="); SERIAL_ECHO(delta[Y_AXIS]);
+    SERIAL_ECHOPGM(" z="); SERIAL_ECHOLN(delta[Z_AXIS]);
+    
+    SERIAL_ECHOPGM("C2="); SERIAL_ECHO(SCARA_C2);
+    SERIAL_ECHOPGM(" S2="); SERIAL_ECHO(SCARA_S2);
+    SERIAL_ECHOPGM(" Theta="); SERIAL_ECHO(SCARA_theta);
+    SERIAL_ECHOPGM(" Psi="); SERIAL_ECHOLN(SCARA_psi);
+    SERIAL_EOL;
+    */
+  }
 
-#endif
+#endif // SCARA
 
 #ifdef TEMP_STAT_LEDS
 
@@ -6395,7 +6399,78 @@ void kill()
       st_synchronize();
     }
   }
-#endif
+
+#endif // FILAMENT_RUNOUT_SENSOR
+
+#ifdef FAST_PWM_FAN
+
+  void setPwmFrequency(uint8_t pin, int val) {
+    val &= 0x07;
+    switch (digitalPinToTimer(pin)) {
+
+      #if defined(TCCR0A)
+        case TIMER0A:
+        case TIMER0B:
+             // TCCR0B &= ~(_BV(CS00) | _BV(CS01) | _BV(CS02));
+             // TCCR0B |= val;
+             break;
+      #endif
+
+      #if defined(TCCR1A)
+        case TIMER1A:
+        case TIMER1B:
+             // TCCR1B &= ~(_BV(CS10) | _BV(CS11) | _BV(CS12));
+             // TCCR1B |= val;
+             break;
+      #endif
+
+      #if defined(TCCR2)
+        case TIMER2:
+        case TIMER2:
+             TCCR2 &= ~(_BV(CS10) | _BV(CS11) | _BV(CS12));
+             TCCR2 |= val;
+             break;
+      #endif
+
+      #if defined(TCCR2A)
+        case TIMER2A:
+        case TIMER2B:
+             TCCR2B &= ~(_BV(CS20) | _BV(CS21) | _BV(CS22));
+             TCCR2B |= val;
+             break;
+      #endif
+
+      #if defined(TCCR3A)
+        case TIMER3A:
+        case TIMER3B:
+        case TIMER3C:
+             TCCR3B &= ~(_BV(CS30) | _BV(CS31) | _BV(CS32));
+             TCCR3B |= val;
+             break;
+      #endif
+
+      #if defined(TCCR4A)
+        case TIMER4A:
+        case TIMER4B:
+        case TIMER4C:
+             TCCR4B &= ~(_BV(CS40) | _BV(CS41) | _BV(CS42));
+             TCCR4B |= val;
+             break;
+      #endif
+
+      #if defined(TCCR5A)
+        case TIMER5A:
+        case TIMER5B:
+        case TIMER5C:
+             TCCR5B &= ~(_BV(CS50) | _BV(CS51) | _BV(CS52));
+             TCCR5B |= val;
+             break;
+      #endif
+
+    }
+  }
+
+#endif // FAST_PWM_FAN
 
 void Stop() {
   disable_all_heaters();
@@ -6408,76 +6483,6 @@ void Stop() {
   }
 }
 
-#ifdef FAST_PWM_FAN
-void setPwmFrequency(uint8_t pin, int val)
-{
-  val &= 0x07;
-  switch(digitalPinToTimer(pin))
-  {
-
-    #if defined(TCCR0A)
-    case TIMER0A:
-    case TIMER0B:
-//         TCCR0B &= ~(_BV(CS00) | _BV(CS01) | _BV(CS02));
-//         TCCR0B |= val;
-         break;
-    #endif
-
-    #if defined(TCCR1A)
-    case TIMER1A:
-    case TIMER1B:
-//         TCCR1B &= ~(_BV(CS10) | _BV(CS11) | _BV(CS12));
-//         TCCR1B |= val;
-         break;
-    #endif
-
-    #if defined(TCCR2)
-    case TIMER2:
-    case TIMER2:
-         TCCR2 &= ~(_BV(CS10) | _BV(CS11) | _BV(CS12));
-         TCCR2 |= val;
-         break;
-    #endif
-
-    #if defined(TCCR2A)
-    case TIMER2A:
-    case TIMER2B:
-         TCCR2B &= ~(_BV(CS20) | _BV(CS21) | _BV(CS22));
-         TCCR2B |= val;
-         break;
-    #endif
-
-    #if defined(TCCR3A)
-    case TIMER3A:
-    case TIMER3B:
-    case TIMER3C:
-         TCCR3B &= ~(_BV(CS30) | _BV(CS31) | _BV(CS32));
-         TCCR3B |= val;
-         break;
-    #endif
-
-    #if defined(TCCR4A)
-    case TIMER4A:
-    case TIMER4B:
-    case TIMER4C:
-         TCCR4B &= ~(_BV(CS40) | _BV(CS41) | _BV(CS42));
-         TCCR4B |= val;
-         break;
-   #endif
-
-    #if defined(TCCR5A)
-    case TIMER5A:
-    case TIMER5B:
-    case TIMER5C:
-         TCCR5B &= ~(_BV(CS50) | _BV(CS51) | _BV(CS52));
-         TCCR5B |= val;
-         break;
-   #endif
-
-  }
-}
-#endif //FAST_PWM_FAN
-
 bool setTargetedHotend(int code){
   target_extruder = active_extruder;
   if (code_seen('T')) {
diff --git a/Marlin/stepper.cpp b/Marlin/stepper.cpp
index 29d77048c..7b00da34e 100644
--- a/Marlin/stepper.cpp
+++ b/Marlin/stepper.cpp
@@ -1,22 +1,23 @@
-/*
-  stepper.c - stepper motor driver: executes motion plans using stepper motors
-  Part of Grbl
-
-  Copyright (c) 2009-2011 Simen Svale Skogsrud
-
-  Grbl is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Grbl is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with Grbl.  If not, see <http://www.gnu.org/licenses/>.
-*/
+/**
+ * stepper.cpp - stepper motor driver: executes motion plans using stepper motors
+ * Marlin Firmware
+ *
+ * Derived from Grbl
+ * Copyright (c) 2009-2011 Simen Svale Skogsrud
+ *
+ * Grbl is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Grbl is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Grbl.  If not, see <http://www.gnu.org/licenses/>.
+ */
 
 /* The timer calculations of this module informed by the 'RepRap cartesian firmware' by Zack Smith
    and Philipp Tiefenbacher. */
@@ -1109,9 +1110,8 @@ long st_get_position(uint8_t axis) {
 
 #ifdef ENABLE_AUTO_BED_LEVELING
 
-  float st_get_position_mm(uint8_t axis) {
-    float steper_position_in_steps = st_get_position(axis);
-    return steper_position_in_steps / axis_steps_per_unit[axis];
+  float st_get_position_mm(AxisEnum axis) {
+    return st_get_position(axis) / axis_steps_per_unit[axis];
   }
 
 #endif  // ENABLE_AUTO_BED_LEVELING
diff --git a/Marlin/stepper.h b/Marlin/stepper.h
index d6c17d60f..15d814332 100644
--- a/Marlin/stepper.h
+++ b/Marlin/stepper.h
@@ -67,9 +67,9 @@ void st_set_e_position(const long &e);
 long st_get_position(uint8_t axis);
 
 #ifdef ENABLE_AUTO_BED_LEVELING
-// Get current position in mm
-float st_get_position_mm(uint8_t axis);
-#endif  //ENABLE_AUTO_BED_LEVELING
+  // Get current position in mm
+  float st_get_position_mm(AxisEnum axis);
+#endif
 
 // The stepper subsystem goes to sleep when it runs out of things to execute. Call this
 // to notify the subsystem that it is time to go to work.