Revert "Change Auto_Bed_Leveling to Auto_Bed_Compensation"

Marlin/Configuration.h

 #define X_MAX_LENGTH (X_MAX_POS - X_MIN_POS)
 #define Y_MAX_LENGTH (Y_MAX_POS - Y_MIN_POS)
 #define Z_MAX_LENGTH (Z_MAX_POS - Z_MIN_POS)
-//============================= Bed Auto Compensation ===========================
+//============================= Bed Auto Leveling ===========================
 
-//#define ENABLE_AUTO_BED_COMPENSATION // Delete the comment to enable (remove // at the start of the line)
-#define Z_PROBE_REPEATABILITY_TEST  // If not commented out, Z-Probe Repeatability test will be included if Auto Bed Compensation is Enabled.
+//#define ENABLE_AUTO_BED_LEVELING // Delete the comment to enable (remove // at the start of the line)
+#define Z_PROBE_REPEATABILITY_TEST  // If not commented out, Z-Probe Repeatability test will be included if Auto Bed Leveling is Enabled.
 
-#ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
 
 // There are 2 different ways to pick the X and Y locations to probe:
 
 //    Probe every point in a rectangular grid
 //    You must specify the rectangle, and the density of sample points
 //    This mode is preferred because there are more measurements.
-//    It used to be called ACCURATE_BED_COMPENSATION but "grid" is more descriptive
+//    It used to be called ACCURATE_BED_LEVELING but "grid" is more descriptive
 
 //  - "3-point" mode
 //    Probe 3 arbitrary points on the bed (that aren't colinear)
 //    You must specify the X & Y coordinates of all 3 points
 
-  #define AUTO_BED_COMPENSATION_GRID
-  // with AUTO_BED_COMPENSATION_GRID, the bed is sampled in a
-  // AUTO_BED_COMPENSATION_GRID_POINTSxAUTO_BED_COMPENSATION_GRID_POINTS grid
+  #define AUTO_BED_LEVELING_GRID
+  // with AUTO_BED_LEVELING_GRID, the bed is sampled in a
+  // AUTO_BED_LEVELING_GRID_POINTSxAUTO_BED_LEVELING_GRID_POINTS grid
   // and least squares solution is calculated
   // Note: this feature occupies 10'206 byte
-  #ifdef AUTO_BED_COMPENSATION_GRID
+  #ifdef AUTO_BED_LEVELING_GRID
 
     // set the rectangle in which to probe
     #define LEFT_PROBE_BED_POSITION 15
 
      // set the number of grid points per dimension
      // I wouldn't see a reason to go above 3 (=9 probing points on the bed)
-    #define AUTO_BED_COMPENSATION_GRID_POINTS 2
+    #define AUTO_BED_LEVELING_GRID_POINTS 2
 
 
-  #else  // not AUTO_BED_COMPENSATION_GRID
+  #else  // not AUTO_BED_LEVELING_GRID
     // with no grid, just probe 3 arbitrary points.  A simple cross-product
     // is used to esimate the plane of the print bed
 
       #define ABL_PROBE_PT_3_X 170
       #define ABL_PROBE_PT_3_Y 20
 
-  #endif // AUTO_BED_COMPENSATION_GRID
+  #endif // AUTO_BED_LEVELING_GRID
 
 
   // these are the offsets to the probe relative to the extruder tip (Hotend - Probe)
 //  #define PROBE_SERVO_DEACTIVATION_DELAY 300
 
 
-//If you have enabled the Bed Auto Compensation and are using the same Z Probe for Z Homing,
+//If you have enabled the Bed Auto Leveling and are using the same Z Probe for Z Homing,
 //it is highly recommended you let this Z_SAFE_HOMING enabled!!!
 
   #define Z_SAFE_HOMING   // This feature is meant to avoid Z homing with probe outside the bed area.
 
   #endif
 
-#endif // ENABLE_AUTO_BED_COMPENSATION
+#endif // ENABLE_AUTO_BED_LEVELING
 
 
 // The position of the homing switches

Marlin/ConfigurationStore.cpp

     absPreheatHPBTemp = ABS_PREHEAT_HPB_TEMP;
     absPreheatFanSpeed = ABS_PREHEAT_FAN_SPEED;
 #endif
-#ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
     zprobe_zoffset = -Z_PROBE_OFFSET_FROM_EXTRUDER;
 #endif
 #ifdef DOGLCD

Marlin/Marlin_main.cpp

 
 #include "Marlin.h"
 
-#ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
 #include "vector_3.h"
-  #ifdef AUTO_BED_COMPENSATION_GRID
+  #ifdef AUTO_BED_LEVELING_GRID
     #include "qr_solve.h"
   #endif
-#endif // ENABLE_AUTO_BED_COMPENSATION
+#endif // ENABLE_AUTO_BED_LEVELING
 
 #include "ultralcd.h"
 #include "planner.h"
   }
   #endif
 
-  #if defined (ENABLE_AUTO_BED_COMPENSATION) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
+  #if defined (ENABLE_AUTO_BED_LEVELING) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
   delay(PROBE_SERVO_DEACTIVATION_DELAY);
   servos[servo_endstops[Z_AXIS]].detach();
   #endif
 #endif
 }
 
-#ifdef ENABLE_AUTO_BED_COMPENSATION
-#ifdef AUTO_BED_COMPENSATION_GRID
-static void set_bed_compensation_equation_lsq(double *plane_equation_coefficients)
+#ifdef ENABLE_AUTO_BED_LEVELING
+#ifdef AUTO_BED_LEVELING_GRID
+static void set_bed_level_equation_lsq(double *plane_equation_coefficients)
 {
     vector_3 planeNormal = vector_3(-plane_equation_coefficients[0], -plane_equation_coefficients[1], 1);
     planeNormal.debug("planeNormal");
-    plan_bed_compensation_matrix = matrix_3x3::create_look_at(planeNormal);
-    //bedCompensation.debug("bedCompensation");
+    plan_bed_level_matrix = matrix_3x3::create_look_at(planeNormal);
+    //bedLevel.debug("bedLevel");
 
-    //plan_bed_compensation_matrix.debug("bed compensation before");
+    //plan_bed_level_matrix.debug("bed level before");
     //vector_3 uncorrected_position = plan_get_position_mm();
     //uncorrected_position.debug("position before");
 
     plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
 }
 
-#else // not AUTO_BED_COMPENSATION_GRID
+#else // not AUTO_BED_LEVELING_GRID
 
-static void set_bed_compensation_equation_3pts(float z_at_pt_1, float z_at_pt_2, float z_at_pt_3) {
+static void set_bed_level_equation_3pts(float z_at_pt_1, float z_at_pt_2, float z_at_pt_3) {
 
-    plan_bed_compensation_matrix.set_to_identity();
+    plan_bed_level_matrix.set_to_identity();
 
     vector_3 pt1 = vector_3(ABL_PROBE_PT_1_X, ABL_PROBE_PT_1_Y, z_at_pt_1);
     vector_3 pt2 = vector_3(ABL_PROBE_PT_2_X, ABL_PROBE_PT_2_Y, z_at_pt_2);
     vector_3 planeNormal = vector_3::cross(from_2_to_1, from_2_to_3).get_normal();
     planeNormal = vector_3(planeNormal.x, planeNormal.y, abs(planeNormal.z));
 
-    plan_bed_compensation_matrix = matrix_3x3::create_look_at(planeNormal);
+    plan_bed_level_matrix = matrix_3x3::create_look_at(planeNormal);
 
     vector_3 corrected_position = plan_get_position();
     current_position[X_AXIS] = corrected_position.x;
 
 }
 
-#endif // AUTO_BED_COMPENSATION_GRID
+#endif // AUTO_BED_LEVELING_GRID
 
 static void run_z_probe() {
-    plan_bed_compensation_matrix.set_to_identity();
+    plan_bed_level_matrix.set_to_identity();
     feedrate = homing_feedrate[Z_AXIS];
 
     // move down until you find the bed
     // Engage Z Servo endstop if enabled
     #ifdef SERVO_ENDSTOPS
     if (servo_endstops[Z_AXIS] > -1) {
-#if defined (ENABLE_AUTO_BED_COMPENSATION) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
+#if defined (ENABLE_AUTO_BED_LEVELING) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
         servos[servo_endstops[Z_AXIS]].attach(0);
 #endif
         servos[servo_endstops[Z_AXIS]].write(servo_endstop_angles[Z_AXIS * 2]);
-#if defined (ENABLE_AUTO_BED_COMPENSATION) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
+#if defined (ENABLE_AUTO_BED_LEVELING) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
         delay(PROBE_SERVO_DEACTIVATION_DELAY);
         servos[servo_endstops[Z_AXIS]].detach();
 #endif
     // Retract Z Servo endstop if enabled
     #ifdef SERVO_ENDSTOPS
     if (servo_endstops[Z_AXIS] > -1) {
-#if defined (ENABLE_AUTO_BED_COMPENSATION) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
+#if defined (ENABLE_AUTO_BED_LEVELING) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
         servos[servo_endstops[Z_AXIS]].attach(0);
 #endif
         servos[servo_endstops[Z_AXIS]].write(servo_endstop_angles[Z_AXIS * 2 + 1]);
-#if defined (ENABLE_AUTO_BED_COMPENSATION) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
+#if defined (ENABLE_AUTO_BED_LEVELING) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
         delay(PROBE_SERVO_DEACTIVATION_DELAY);
         servos[servo_endstops[Z_AXIS]].detach();
 #endif
   return measured_z;
 }
 
-#endif // #ifdef ENABLE_AUTO_BED_COMPENSATION
+#endif // #ifdef ENABLE_AUTO_BED_LEVELING
 
 static void homeaxis(int axis) {
 #define HOMEAXIS_DO(LETTER) \
 #ifndef Z_PROBE_SLED
     // Engage Servo endstop if enabled
     #ifdef SERVO_ENDSTOPS
-      #if defined (ENABLE_AUTO_BED_COMPENSATION) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
+      #if defined (ENABLE_AUTO_BED_LEVELING) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
         if (axis==Z_AXIS) {
           engage_z_probe();
         }
         servos[servo_endstops[axis]].write(servo_endstop_angles[axis * 2 + 1]);
       }
     #endif
-#if defined (ENABLE_AUTO_BED_COMPENSATION) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
+#if defined (ENABLE_AUTO_BED_LEVELING) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
   #ifndef Z_PROBE_SLED
     if (axis==Z_AXIS) retract_z_probe();
   #endif
 {
   unsigned long codenum; //throw away variable
   char *starpos = NULL;
-#ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
   float x_tmp, y_tmp, z_tmp, real_z;
 #endif
   if(code_seen('G'))
       break;
       #endif //FWRETRACT
     case 28: //G28 Home all Axis one at a time
-#ifdef ENABLE_AUTO_BED_COMPENSATION
-      plan_bed_compensation_matrix.set_to_identity();  //Reset the plane ("erase" all compensation data)
-#endif //ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
+      plan_bed_level_matrix.set_to_identity();  //Reset the plane ("erase" all leveling data)
+#endif //ENABLE_AUTO_BED_LEVELING
 
       saved_feedrate = feedrate;
       saved_feedmultiply = feedmultiply;
           current_position[Z_AXIS]=code_value()+add_homing[Z_AXIS];
         }
       }
-      #ifdef ENABLE_AUTO_BED_COMPENSATION
+      #ifdef ENABLE_AUTO_BED_LEVELING
         if((home_all_axis) || (code_seen(axis_codes[Z_AXIS]))) {
           current_position[Z_AXIS] += zprobe_zoffset;  //Add Z_Probe offset (the distance is negative)
         }
       endstops_hit_on_purpose();
       break;
 
-#ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
     case 29: // G29 Detailed Z-Probe, probes the bed at 3 or more points.
         {
             #if Z_MIN_PIN == -1
-            #error "You must have a Z_MIN endstop in order to enable Auto Bed Compensation feature!!! Z_MIN_PIN must point to a valid hardware pin."
+            #error "You must have a Z_MIN endstop in order to enable Auto Bed Leveling feature!!! Z_MIN_PIN must point to a valid hardware pin."
             #endif
 
             // Prevent user from running a G29 without first homing in X and Y
             dock_sled(false);
 #endif // Z_PROBE_SLED
             st_synchronize();
-            // make sure the bed_compensation_rotation_matrix is identity or the planner will get it incorectly
+            // make sure the bed_level_rotation_matrix is identity or the planner will get it incorectly
             //vector_3 corrected_position = plan_get_position_mm();
             //corrected_position.debug("position before G29");
-            plan_bed_compensation_matrix.set_to_identity();
+            plan_bed_level_matrix.set_to_identity();
             vector_3 uncorrected_position = plan_get_position();
             //uncorrected_position.debug("position durring G29");
             current_position[X_AXIS] = uncorrected_position.x;
             setup_for_endstop_move();
 
             feedrate = homing_feedrate[Z_AXIS];
-#ifdef AUTO_BED_COMPENSATION_GRID
+#ifdef AUTO_BED_LEVELING_GRID
             // probe at the points of a lattice grid
 
-            int xGridSpacing = (RIGHT_PROBE_BED_POSITION - LEFT_PROBE_BED_POSITION) / (AUTO_BED_COMPENSATION_GRID_POINTS-1);
-            int yGridSpacing = (BACK_PROBE_BED_POSITION - FRONT_PROBE_BED_POSITION) / (AUTO_BED_COMPENSATION_GRID_POINTS-1);
+            int xGridSpacing = (RIGHT_PROBE_BED_POSITION - LEFT_PROBE_BED_POSITION) / (AUTO_BED_LEVELING_GRID_POINTS-1);
+            int yGridSpacing = (BACK_PROBE_BED_POSITION - FRONT_PROBE_BED_POSITION) / (AUTO_BED_LEVELING_GRID_POINTS-1);
 
 
             // solve the plane equation ax + by + d = z
             // so Vx = -a Vy = -b Vz = 1 (we want the vector facing towards positive Z
 
             // "A" matrix of the linear system of equations
-            double eqnAMatrix[AUTO_BED_COMPENSATION_GRID_POINTS*AUTO_BED_COMPENSATION_GRID_POINTS*3];
+            double eqnAMatrix[AUTO_BED_LEVELING_GRID_POINTS*AUTO_BED_LEVELING_GRID_POINTS*3];
             // "B" vector of Z points
-            double eqnBVector[AUTO_BED_COMPENSATION_GRID_POINTS*AUTO_BED_COMPENSATION_GRID_POINTS];
+            double eqnBVector[AUTO_BED_LEVELING_GRID_POINTS*AUTO_BED_LEVELING_GRID_POINTS];
 
 
             int probePointCounter = 0;
                 zig = true;
               }
 
-              for (int xCount=0; xCount < AUTO_BED_COMPENSATION_GRID_POINTS; xCount++)
+              for (int xCount=0; xCount < AUTO_BED_LEVELING_GRID_POINTS; xCount++)
               {
                 float z_before;
                 if (probePointCounter == 0)
 
                 eqnBVector[probePointCounter] = measured_z;
 
-                eqnAMatrix[probePointCounter + 0*AUTO_BED_COMPENSATION_GRID_POINTS*AUTO_BED_COMPENSATION_GRID_POINTS] = xProbe;
-                eqnAMatrix[probePointCounter + 1*AUTO_BED_COMPENSATION_GRID_POINTS*AUTO_BED_COMPENSATION_GRID_POINTS] = yProbe;
-                eqnAMatrix[probePointCounter + 2*AUTO_BED_COMPENSATION_GRID_POINTS*AUTO_BED_COMPENSATION_GRID_POINTS] = 1;
+                eqnAMatrix[probePointCounter + 0*AUTO_BED_LEVELING_GRID_POINTS*AUTO_BED_LEVELING_GRID_POINTS] = xProbe;
+                eqnAMatrix[probePointCounter + 1*AUTO_BED_LEVELING_GRID_POINTS*AUTO_BED_LEVELING_GRID_POINTS] = yProbe;
+                eqnAMatrix[probePointCounter + 2*AUTO_BED_LEVELING_GRID_POINTS*AUTO_BED_LEVELING_GRID_POINTS] = 1;
                 probePointCounter++;
                 xProbe += xInc;
               }
             clean_up_after_endstop_move();
 
             // solve lsq problem
-            double *plane_equation_coefficients = qr_solve(AUTO_BED_COMPENSATION_GRID_POINTS*AUTO_BED_COMPENSATION_GRID_POINTS, 3, eqnAMatrix, eqnBVector);
+            double *plane_equation_coefficients = qr_solve(AUTO_BED_LEVELING_GRID_POINTS*AUTO_BED_LEVELING_GRID_POINTS, 3, eqnAMatrix, eqnBVector);
 
             SERIAL_PROTOCOLPGM("Eqn coefficients: a: ");
             SERIAL_PROTOCOL(plane_equation_coefficients[0]);
             SERIAL_PROTOCOLLN(plane_equation_coefficients[2]);
 
 
-            set_bed_compensation_equation_lsq(plane_equation_coefficients);
+            set_bed_level_equation_lsq(plane_equation_coefficients);
 
             free(plane_equation_coefficients);
 
-#else // AUTO_BED_COMPENSATION_GRID not defined
+#else // AUTO_BED_LEVELING_GRID not defined
 
             // Probe at 3 arbitrary points
             // probe 1
 
             clean_up_after_endstop_move();
 
-            set_bed_compensation_equation_3pts(z_at_pt_1, z_at_pt_2, z_at_pt_3);
+            set_bed_level_equation_3pts(z_at_pt_1, z_at_pt_2, z_at_pt_3);
 
 
-#endif // AUTO_BED_COMPENSATION_GRID
+#endif // AUTO_BED_LEVELING_GRID
             st_synchronize();
 
             // The following code correct the Z height difference from z-probe position and hotend tip position.
             // The Z height on homing is measured by Z-Probe, but the probe is quite far from the hotend.
             // When the bed is uneven, this height must be corrected.
-            real_z = float(st_get_position(Z_AXIS))/axis_steps_per_unit[Z_AXIS];  //get the real Z (since the auto bed compensation is already correcting the plane)
+            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)
             x_tmp = current_position[X_AXIS] + X_PROBE_OFFSET_FROM_EXTRUDER;
             y_tmp = current_position[Y_AXIS] + Y_PROBE_OFFSET_FROM_EXTRUDER;
             z_tmp = current_position[Z_AXIS];
 
-            apply_rotation_xyz(plan_bed_compensation_matrix, x_tmp, y_tmp, z_tmp);         //Apply the correction sending the probe offset
+            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.
             plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
 #ifdef Z_PROBE_SLED
         {
             engage_z_probe(); // Engage Z Servo endstop if available
             st_synchronize();
-            // TODO: make sure the bed_compensation_rotation_matrix is identity or the planner will get set incorectly
+            // TODO: make sure the bed_level_rotation_matrix is identity or the planner will get set incorectly
             setup_for_endstop_move();
 
             feedrate = homing_feedrate[Z_AXIS];
         dock_sled(false);
         break;
 #endif // Z_PROBE_SLED
-#endif // ENABLE_AUTO_BED_COMPENSATION
+#endif // ENABLE_AUTO_BED_LEVELING
     case 90: // G90
       relative_mode = false;
       break;
 //	
 // This function assumes the bed has been homed.  Specificaly, that a G28 command
 // as been issued prior to invoking the M48 Z-Probe repeatability measurement function.
-// Any information generated by a prior G29 Bed compensation command will be lost and need to be
+// Any information generated by a prior G29 Bed leveling command will be lost and need to be
 // regenerated.
 //
 // The number of samples will default to 10 if not specified.  You can use upper or lower case
 // N for its communication protocol and will get horribly confused if you send it a capital N.
 //
 
-#ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
 #ifdef Z_PROBE_REPEATABILITY_TEST 
 
     case 48: // M48 Z-Probe repeatability
 //
 
         st_synchronize();
-        plan_bed_compensation_matrix.set_to_identity();
+        plan_bed_level_matrix.set_to_identity();
 	plan_buffer_line( X_current, Y_current, Z_start_location,
 			ext_position,
     			homing_feedrate[Z_AXIS]/60,
         break;
 	}
 #endif		// Z_PROBE_REPEATABILITY_TEST 
-#endif		// ENABLE_AUTO_BED_COMPENSATION
+#endif		// ENABLE_AUTO_BED_LEVELING
 
     case 104: // M104
       if(setTargetedHotend(104)){
         if (code_seen('S')) {
           servo_position = code_value();
           if ((servo_index >= 0) && (servo_index < NUM_SERVOS)) {
-#if defined (ENABLE_AUTO_BED_COMPENSATION) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
+#if defined (ENABLE_AUTO_BED_LEVELING) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
 		      servos[servo_index].attach(0);
 #endif
             servos[servo_index].write(servo_position);
-#if defined (ENABLE_AUTO_BED_COMPENSATION) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
+#if defined (ENABLE_AUTO_BED_LEVELING) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
               delay(PROBE_SERVO_DEACTIVATION_DELAY);
               servos[servo_index].detach();
 #endif
       st_synchronize();
     }
     break;
-#if defined(ENABLE_AUTO_BED_COMPENSATION) && defined(SERVO_ENDSTOPS) && not defined(Z_PROBE_SLED)
+#if defined(ENABLE_AUTO_BED_LEVELING) && defined(SERVO_ENDSTOPS) && not defined(Z_PROBE_SLED)
     case 401:
     {
         engage_z_probe();    // Engage Z Servo endstop if available

Marlin/Servo.cpp

 uint8_t Servo::attach(int pin, int min, int max)
 {
   if(this->servoIndex < MAX_SERVOS ) {
-#if defined (ENABLE_AUTO_BED_COMPENSATION) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
+#if defined (ENABLE_AUTO_BED_LEVELING) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
     if (pin > 0) this->pin = pin; else pin = this->pin;
 #endif
     pinMode( pin, OUTPUT) ;                                   // set servo pin to output

Marlin/Servo.h

   int read();                        // returns current pulse width as an angle between 0 and 180 degrees
   int readMicroseconds();            // returns current pulse width in microseconds for this servo (was read_us() in first release)
   bool attached();                   // return true if this servo is attached, otherwise false
-#if defined (ENABLE_AUTO_BED_COMPENSATION) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
+#if defined (ENABLE_AUTO_BED_LEVELING) && (PROBE_SERVO_DEACTIVATION_DELAY > 0)
   int pin;                           // store the hardware pin of the servo
 #endif
 private:

Marlin/planner.cpp

 float mintravelfeedrate;
 unsigned long axis_steps_per_sqr_second[NUM_AXIS];
 
-#ifdef ENABLE_AUTO_BED_COMPENSATION
-// this holds the required transform to compensate for bed compensation
-matrix_3x3 plan_bed_compensation_matrix = {
+#ifdef ENABLE_AUTO_BED_LEVELING
+// this holds the required transform to compensate for bed level
+matrix_3x3 plan_bed_level_matrix = {
 	1.0, 0.0, 0.0,
 	0.0, 1.0, 0.0,
 	0.0, 0.0, 1.0,
 };
-#endif // #ifdef ENABLE_AUTO_BED_COMPENSATION
+#endif // #ifdef ENABLE_AUTO_BED_LEVELING
 
 // The current position of the tool in absolute steps
 long position[NUM_AXIS];   //rescaled from extern when axis_steps_per_unit are changed by gcode
 // Add a new linear movement to the buffer. steps_x, _y and _z is the absolute position in 
 // mm. Microseconds specify how many microseconds the move should take to perform. To aid acceleration
 // calculation the caller must also provide the physical length of the line in millimeters.
-#ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
 void plan_buffer_line(float x, float y, float z, const float &e, float feed_rate, const uint8_t &extruder)
 #else
 void plan_buffer_line(const float &x, const float &y, const float &z, const float &e, float feed_rate, const uint8_t &extruder)
-#endif  //ENABLE_AUTO_BED_COMPENSATION
+#endif  //ENABLE_AUTO_BED_LEVELING
 {
   // Calculate the buffer head after we push this byte
   int next_buffer_head = next_block_index(block_buffer_head);
     lcd_update();
   }
 
-#ifdef ENABLE_AUTO_BED_COMPENSATION
-  apply_rotation_xyz(plan_bed_compensation_matrix, x, y, z);
-#endif // ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
+  apply_rotation_xyz(plan_bed_level_matrix, x, y, z);
+#endif // ENABLE_AUTO_BED_LEVELING
 
   // The target position of the tool in absolute steps
   // Calculate target position in absolute steps
   st_wake_up();
 }
 
-#ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
 vector_3 plan_get_position() {
 	vector_3 position = vector_3(st_get_position_mm(X_AXIS), st_get_position_mm(Y_AXIS), st_get_position_mm(Z_AXIS));
 
 	//position.debug("in plan_get position");
-	//plan_bed_compensation_matrix.debug("in plan_get bed_compensation");
-	matrix_3x3 inverse = matrix_3x3::transpose(plan_bed_compensation_matrix);
+	//plan_bed_level_matrix.debug("in plan_get bed_level");
+	matrix_3x3 inverse = matrix_3x3::transpose(plan_bed_level_matrix);
 	//inverse.debug("in plan_get inverse");
 	position.apply_rotation(inverse);
 	//position.debug("after rotation");
 
 	return position;
 }
-#endif // ENABLE_AUTO_BED_COMPENSATION
+#endif // ENABLE_AUTO_BED_LEVELING
 
-#ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
 void plan_set_position(float x, float y, float z, const float &e)
 {
-  apply_rotation_xyz(plan_bed_compensation_matrix, x, y, z);
+  apply_rotation_xyz(plan_bed_level_matrix, x, y, z);
 #else
 void plan_set_position(const float &x, const float &y, const float &z, const float &e)
 {
-#endif // ENABLE_AUTO_BED_COMPENSATION
+#endif // ENABLE_AUTO_BED_LEVELING
 
   position[X_AXIS] = lround(x*axis_steps_per_unit[X_AXIS]);
   position[Y_AXIS] = lround(y*axis_steps_per_unit[Y_AXIS]);

Marlin/planner.h

 
 #include "Marlin.h"
 
-#ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
 #include "vector_3.h"
-#endif // ENABLE_AUTO_BED_COMPENSATION
+#endif // ENABLE_AUTO_BED_LEVELING
 
 // This struct is used when buffering the setup for each linear movement "nominal" values are as specified in 
 // the source g-code and may never actually be reached if acceleration management is active.
   volatile char busy;
 } block_t;
 
-#ifdef ENABLE_AUTO_BED_COMPENSATION
-// this holds the required transform to compensate for bed compensation
-extern matrix_3x3 plan_bed_compensation_matrix;
-#endif // #ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
+// this holds the required transform to compensate for bed level
+extern matrix_3x3 plan_bed_level_matrix;
+#endif // #ifdef ENABLE_AUTO_BED_LEVELING
 
 // Initialize the motion plan subsystem      
 void plan_init();
 // Add a new linear movement to the buffer. x, y and z is the signed, absolute target position in 
 // millimaters. Feed rate specifies the speed of the motion.
 
-#ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
 void plan_buffer_line(float x, float y, float z, const float &e, float feed_rate, const uint8_t &extruder);
 
-// Get the position applying the bed compensation matrix if enabled
+// Get the position applying the bed level matrix if enabled
 vector_3 plan_get_position();
 #else
 void plan_buffer_line(const float &x, const float &y, const float &z, const float &e, float feed_rate, const uint8_t &extruder);
-#endif // ENABLE_AUTO_BED_COMPENSATION
+#endif // ENABLE_AUTO_BED_LEVELING
 
 // Set position. Used for G92 instructions.
-#ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
 void plan_set_position(float x, float y, float z, const float &e);
 #else
 void plan_set_position(const float &x, const float &y, const float &z, const float &e);
-#endif // ENABLE_AUTO_BED_COMPENSATION
+#endif // ENABLE_AUTO_BED_LEVELING
 
 void plan_set_e_position(const float &e);
 

Marlin/qr_solve.cpp

 #include "qr_solve.h"
 
-#ifdef AUTO_BED_COMPENSATION_GRID
+#ifdef AUTO_BED_LEVELING_GRID
 
 #include <stdlib.h>
 #include <math.h>

Marlin/qr_solve.h

 #include "Configuration.h"
 
-#ifdef AUTO_BED_COMPENSATION_GRID
+#ifdef AUTO_BED_LEVELING_GRID
 
 void daxpy ( int n, double da, double dx[], int incx, double dy[], int incy );
 double ddot ( int n, double dx[], int incx, double dy[], int incy );

Marlin/vector_3.cpp

 /*
-  vector_3.cpp - Vector library for bed compensation
+  vector_3.cpp - Vector library for bed leveling
   Copyright (c) 2012 Lars Brubaker.  All right reserved.
 
   This library is free software; you can redistribute it and/or
 #include <math.h>
 #include "Marlin.h"
 
-#ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
 #include "vector_3.h"
 
 vector_3::vector_3() : x(0), y(0), z(0) { }
 	}
 }
 
-#endif // #ifdef ENABLE_AUTO_BED_COMPENSATION
+#endif // #ifdef ENABLE_AUTO_BED_LEVELING
 

Marlin/vector_3.h

 /*
-  vector_3.cpp - Vector library for bed compensation
+  vector_3.cpp - Vector library for bed leveling
   Copyright (c) 2012 Lars Brubaker.  All right reserved.
 
   This library is free software; you can redistribute it and/or
 #ifndef VECTOR_3_H
 #define VECTOR_3_H
 
-#ifdef ENABLE_AUTO_BED_COMPENSATION
+#ifdef ENABLE_AUTO_BED_LEVELING
 class matrix_3x3;
 
 struct vector_3
 
 
 void apply_rotation_xyz(matrix_3x3 rotationMatrix, float &x, float& y, float& z);
-#endif // ENABLE_AUTO_BED_COMPENSATION
+#endif // ENABLE_AUTO_BED_LEVELING
 
 #endif // VECTOR_3_H

README.md

 *   Configurable serial port to support connection of wireless adaptors.
 *   Automatic operation of extruder/cold-end cooling fans based on nozzle temperature
 *   RC Servo Support, specify angle or duration for continuous rotation servos.
-*   Auto Bed Compensation.
+*   Bed Auto Leveling.
 *   Support for a filament diameter sensor, which adjusts extrusion volume
 
 The default baudrate is 250000. This baudrate has less jitter and hence errors than the usual 115200 baud, but is less supported by drivers and host-environments.
 That's ok.  Enjoy Silky Smooth Printing.
 
 ===============================================
-Instructions for configuring Auto Bed Compensation
+Instructions for configuring Bed Auto Leveling
 ===============================================
 There are two options for this feature. You may choose to use a servo mounted on the X carriage or you may use a sled that mounts on the X axis and can be docked when not in use.
 See the section for each option below for specifics about installation and configuration. Also included are instructions that apply to both options.
 Instructions for Both Options
 -----------------------------
 
-Uncomment the "ENABLE_AUTO_BED_COMPENSATION" define (commented by default)
+Uncomment the "ENABLE_AUTO_BED_LEVELING" define (commented by default)
 
 The following options define the probing positions. These are good starting values.
 I recommend to keep a better clearance from borders in the first run and then make the probes as close as possible to borders:
 * \#define Y_PROBE_OFFSET_FROM_EXTRUDER 10
 * \#define Z_PROBE_OFFSET_FROM_EXTRUDER 2.75
 
-That's it.. enjoy never having to calibrate your Z endstop neither tramming your bed by hand anymore ;-)
+That's it.. enjoy never having to calibrate your Z endstop neither leveling your bed by hand anymore ;-)
 
 Filament Sensor
 ---------------