♻️ Refactor axis counts and loops

Marlin/src/core/types.h

 //  - X_HEAD, Y_HEAD, and Z_HEAD should be used for Steppers on Core kinematics
 //
 enum AxisEnum : uint8_t {
-  X_AXIS   = 0, A_AXIS = 0,
-  Y_AXIS   = 1, B_AXIS = 1,
-  Z_AXIS   = 2, C_AXIS = 2,
-  E_AXIS   = 3,
-  X_HEAD   = 4, Y_HEAD = 5, Z_HEAD = 6,
-  E0_AXIS  = 3,
+  X_AXIS = 0, A_AXIS = X_AXIS,
+  Y_AXIS = 1, B_AXIS = Y_AXIS,
+  Z_AXIS = 2, C_AXIS = Z_AXIS,
+  E_AXIS,
+  X_HEAD, Y_HEAD, Z_HEAD,
+  E0_AXIS = E_AXIS,
   E1_AXIS, E2_AXIS, E3_AXIS, E4_AXIS, E5_AXIS, E6_AXIS, E7_AXIS,
-  ALL_AXES = 0xFE, NO_AXIS = 0xFF
+  ALL_AXES_MASK = 0xFE, NO_AXIS_MASK = 0xFF
 };
 
 //
-// Loop over XYZE axes
+// Loop over axes
 //
-#define LOOP_XYZ(VAR) LOOP_S_LE_N(VAR, X_AXIS, Z_AXIS)
-#define LOOP_XYZE(VAR) LOOP_S_LE_N(VAR, X_AXIS, E_AXIS)
-#define LOOP_XYZE_N(VAR) LOOP_S_L_N(VAR, X_AXIS, XYZE_N)
 #define LOOP_ABC(VAR) LOOP_S_LE_N(VAR, A_AXIS, C_AXIS)
-#define LOOP_ABCE(VAR) LOOP_S_LE_N(VAR, A_AXIS, E_AXIS)
-#define LOOP_ABCE_N(VAR) LOOP_S_L_N(VAR, A_AXIS, XYZE_N)
+#define LOOP_LINEAR_AXES(VAR) LOOP_S_L_N(VAR, X_AXIS, LINEAR_AXES)
+#define LOOP_LOGICAL_AXES(VAR) LOOP_S_L_N(VAR, X_AXIS, LOGICAL_AXES)
+#define LOOP_DISTINCT_AXES(VAR) LOOP_S_L_N(VAR, X_AXIS, DISTINCT_AXES)
 
 //
 // feedRate_t is just a humble float
   FI void set(const T (&arr)[XY])                       { x = arr[0]; y = arr[1]; }
   FI void set(const T (&arr)[XYZ])                      { x = arr[0]; y = arr[1]; }
   FI void set(const T (&arr)[XYZE])                     { x = arr[0]; y = arr[1]; }
-  #if XYZE_N > XYZE
-    FI void set(const T (&arr)[XYZE_N])                 { x = arr[0]; y = arr[1]; }
+  #if DISTINCT_AXES > LOGICAL_AXES
+    FI void set(const T (&arr)[DISTINCT_AXES])          { x = arr[0]; y = arr[1]; }
   #endif
   FI void reset()                                       { x = y = 0; }
   FI T magnitude()                                const { return (T)sqrtf(x*x + y*y); }
   FI void set(const T (&arr)[XY])                      { x = arr[0]; y = arr[1]; }
   FI void set(const T (&arr)[XYZ])                     { x = arr[0]; y = arr[1]; z = arr[2]; }
   FI void set(const T (&arr)[XYZE])                    { x = arr[0]; y = arr[1]; z = arr[2]; }
-  #if XYZE_N > XYZE
-    FI void set(const T (&arr)[XYZE_N])                { x = arr[0]; y = arr[1]; z = arr[2]; }
+  #if DISTINCT_AXES > XYZE
+    FI void set(const T (&arr)[DISTINCT_AXES])         { x = arr[0]; y = arr[1]; z = arr[2]; }
   #endif
   FI void reset()                                      { x = y = z = 0; }
   FI T magnitude()                               const { return (T)sqrtf(x*x + y*y + z*z); }
   FI void set(const T (&arr)[XY])                             { x = arr[0]; y = arr[1]; }
   FI void set(const T (&arr)[XYZ])                            { x = arr[0]; y = arr[1]; z = arr[2]; }
   FI void set(const T (&arr)[XYZE])                           { x = arr[0]; y = arr[1]; z = arr[2]; e = arr[3]; }
-  #if XYZE_N > XYZE
-    FI void set(const T (&arr)[XYZE_N])                       { x = arr[0]; y = arr[1]; z = arr[2]; e = arr[3]; }
+  #if DISTINCT_AXES > XYZE
+    FI void set(const T (&arr)[DISTINCT_AXES])                { x = arr[0]; y = arr[1]; z = arr[2]; e = arr[3]; }
   #endif
   FI XYZEval<T>          copy()                         const { return *this; }
   FI XYZEval<T>           ABS()                         const { return { T(_ABS(x)), T(_ABS(y)), T(_ABS(z)), T(_ABS(e)) }; }
 #undef FI
 
 const xyze_char_t axis_codes { 'X', 'Y', 'Z', 'E' };
-#define XYZ_CHAR(A) ((char)('X' + A))
+#define AXIS_CHAR(A) ((char)('X' + A))

Marlin/src/core/utility.cpp

         #endif
         #if ABL_PLANAR
           SERIAL_ECHOPGM("ABL Adjustment X");
-          LOOP_XYZ(a) {
+          LOOP_LINEAR_AXES(a) {
             const float v = planner.get_axis_position_mm(AxisEnum(a)) - current_position[a];
-            SERIAL_CHAR(' ', XYZ_CHAR(a));
+            SERIAL_CHAR(' ', AXIS_CHAR(a));
             if (v > 0) SERIAL_CHAR('+');
             SERIAL_DECIMAL(v);
           }

Marlin/src/feature/backlash.cpp

 
   const float f_corr = float(correction) / 255.0f;
 
-  LOOP_XYZ(axis) {
+  LOOP_LINEAR_AXES(axis) {
     if (distance_mm[axis]) {
       const bool reversing = TEST(dm,axis);
 

Marlin/src/feature/dac/dac_mcp4728.cpp

 uint8_t MCP4728::eepromWrite() {
   Wire.beginTransmission(I2C_ADDRESS(DAC_DEV_ADDRESS));
   Wire.write(SEQWRITE);
-  LOOP_XYZE(i) {
+  LOOP_LOGICAL_AXES(i) {
     Wire.write(DAC_STEPPER_VREF << 7 | DAC_STEPPER_GAIN << 4 | highByte(dac_values[i]));
     Wire.write(lowByte(dac_values[i]));
   }
  */
 uint8_t MCP4728::fastWrite() {
   Wire.beginTransmission(I2C_ADDRESS(DAC_DEV_ADDRESS));
-  LOOP_XYZE(i) {
+  LOOP_LOGICAL_AXES(i) {
     Wire.write(highByte(dac_values[i]));
     Wire.write(lowByte(dac_values[i]));
   }

Marlin/src/feature/dac/stepper_dac.cpp

 
 uint8_t StepperDAC::get_current_percent(const AxisEnum axis) { return mcp4728.getDrvPct(dac_order[axis]); }
 void StepperDAC::set_current_percents(xyze_uint8_t &pct) {
-  LOOP_XYZE(i) dac_channel_pct[i] = pct[dac_order[i]];
+  LOOP_LOGICAL_AXES(i) dac_channel_pct[i] = pct[dac_order[i]];
   mcp4728.setDrvPct(dac_channel_pct);
 }
 

Marlin/src/feature/encoder_i2c.cpp

   ec = false;
 
   xyze_pos_t startCoord, endCoord;
-  LOOP_XYZ(a) {
+  LOOP_LINEAR_AXES(a) {
     startCoord[a] = planner.get_axis_position_mm((AxisEnum)a);
     endCoord[a] = planner.get_axis_position_mm((AxisEnum)a);
   }
   travelDistance = endDistance - startDistance;
 
   xyze_pos_t startCoord, endCoord;
-  LOOP_XYZ(a) {
+  LOOP_LINEAR_AXES(a) {
     startCoord[a] = planner.get_axis_position_mm((AxisEnum)a);
     endCoord[a] = planner.get_axis_position_mm((AxisEnum)a);
   }
   const bool hasU = parser.seen_test('U'), hasO = parser.seen_test('O');
 
   if (I2CPE_idx == 0xFF) {
-    LOOP_XYZE(i) {
+    LOOP_LOGICAL_AXES(i) {
       if (!I2CPE_anyaxis || parser.seen_test(axis_codes[i])) {
         const uint8_t idx = idx_from_axis(AxisEnum(i));
         if ((int8_t)idx >= 0) report_position(idx, hasU, hasO);
   if (parse()) return;
 
   if (I2CPE_idx == 0xFF) {
-    LOOP_XYZE(i) {
+    LOOP_LOGICAL_AXES(i) {
       if (!I2CPE_anyaxis || parser.seen(axis_codes[i])) {
         const uint8_t idx = idx_from_axis(AxisEnum(i));
         if ((int8_t)idx >= 0) report_status(idx);
   if (parse()) return;
 
   if (I2CPE_idx == 0xFF) {
-    LOOP_XYZE(i) {
+    LOOP_LOGICAL_AXES(i) {
       if (!I2CPE_anyaxis || parser.seen(axis_codes[i])) {
         const uint8_t idx = idx_from_axis(AxisEnum(i));
         if ((int8_t)idx >= 0) test_axis(idx);
   const uint8_t iterations = constrain(parser.byteval('P', 1), 1, 10);
 
   if (I2CPE_idx == 0xFF) {
-    LOOP_XYZE(i) {
+    LOOP_LOGICAL_AXES(i) {
       if (!I2CPE_anyaxis || parser.seen(axis_codes[i])) {
         const uint8_t idx = idx_from_axis(AxisEnum(i));
         if ((int8_t)idx >= 0) calibrate_steps_mm(idx, iterations);
   if (parse()) return;
 
   if (!I2CPE_addr) {
-    LOOP_XYZE(i) {
+    LOOP_LOGICAL_AXES(i) {
       if (!I2CPE_anyaxis || parser.seen(axis_codes[i])) {
         const uint8_t idx = idx_from_axis(AxisEnum(i));
         if ((int8_t)idx >= 0) report_module_firmware(encoders[idx].get_address());
   const bool hasR = parser.seen_test('R');
 
   if (I2CPE_idx == 0xFF) {
-    LOOP_XYZE(i) {
+    LOOP_LOGICAL_AXES(i) {
       if (!I2CPE_anyaxis || parser.seen(axis_codes[i])) {
         const uint8_t idx = idx_from_axis(AxisEnum(i));
         if ((int8_t)idx >= 0) {
   const int8_t onoff = parser.seenval('S') ? parser.value_int() : -1;
 
   if (I2CPE_idx == 0xFF) {
-    LOOP_XYZE(i) {
+    LOOP_LOGICAL_AXES(i) {
       if (!I2CPE_anyaxis || parser.seen(axis_codes[i])) {
         const uint8_t idx = idx_from_axis(AxisEnum(i));
         if ((int8_t)idx >= 0) {
   const float newThreshold = parser.seenval('T') ? parser.value_float() : -9999;
 
   if (I2CPE_idx == 0xFF) {
-    LOOP_XYZE(i) {
+    LOOP_LOGICAL_AXES(i) {
       if (!I2CPE_anyaxis || parser.seen(axis_codes[i])) {
         const uint8_t idx = idx_from_axis(AxisEnum(i));
         if ((int8_t)idx >= 0) {
   if (parse()) return;
 
   if (I2CPE_idx == 0xFF) {
-    LOOP_XYZE(i) {
+    LOOP_LOGICAL_AXES(i) {
       if (!I2CPE_anyaxis || parser.seen(axis_codes[i])) {
         const uint8_t idx = idx_from_axis(AxisEnum(i));
         if ((int8_t)idx >= 0) report_error(idx);

Marlin/src/feature/joystick.cpp

     // norm_jog values of [-1 .. 1] maps linearly to [-feedrate .. feedrate]
     xyz_float_t move_dist{0};
     float hypot2 = 0;
-    LOOP_XYZ(i) if (norm_jog[i]) {
+    LOOP_LINEAR_AXES(i) if (norm_jog[i]) {
       move_dist[i] = seg_time * norm_jog[i] * TERN(EXTENSIBLE_UI, manual_feedrate_mm_s, planner.settings.max_feedrate_mm_s)[i];
       hypot2 += sq(move_dist[i]);
     }

Marlin/src/feature/powerloss.cpp

   TERN_(HAS_HOME_OFFSET, home_offset = info.home_offset);
   TERN_(HAS_POSITION_SHIFT, position_shift = info.position_shift);
   #if HAS_HOME_OFFSET || HAS_POSITION_SHIFT
-    LOOP_XYZ(i) update_workspace_offset((AxisEnum)i);
+    LOOP_LINEAR_AXES(i) update_workspace_offset((AxisEnum)i);
   #endif
 
   // Relative axis modes
     if (info.valid_head) {
       if (info.valid_head == info.valid_foot) {
         DEBUG_ECHOPGM("current_position: ");
-        LOOP_XYZE(i) {
+        LOOP_LOGICAL_AXES(i) {
           if (i) DEBUG_CHAR(',');
           DEBUG_DECIMAL(info.current_position[i]);
         }
 
         #if HAS_HOME_OFFSET
           DEBUG_ECHOPGM("home_offset: ");
-          LOOP_XYZ(i) {
+          LOOP_LINEAR_AXES(i) {
             if (i) DEBUG_CHAR(',');
             DEBUG_DECIMAL(info.home_offset[i]);
           }
 
         #if HAS_POSITION_SHIFT
           DEBUG_ECHOPGM("position_shift: ");
-          LOOP_XYZ(i) {
+          LOOP_LINEAR_AXES(i) {
             if (i) DEBUG_CHAR(',');
             DEBUG_DECIMAL(info.position_shift[i]);
           }

Marlin/src/gcode/calibrate/G28.cpp

 
   #if ENABLED(MARLIN_DEV_MODE)
     if (parser.seen_test('S')) {
-      LOOP_XYZ(a) set_axis_is_at_home((AxisEnum)a);
+      LOOP_LINEAR_AXES(a) set_axis_is_at_home((AxisEnum)a);
       sync_plan_position();
       SERIAL_ECHOLNPGM("Simulated Homing");
       report_current_position();

Marlin/src/gcode/calibrate/G33.cpp

   abc_float_t delta_e = { 0.0f }, delta_t = { 0.0f };
 
   delta_t.reset();
-  LOOP_XYZ(axis) {
+  LOOP_LINEAR_AXES(axis) {
     delta_t[axis] = diff;
     calc_kinematics_diff_probe_points(z_pt, delta_e, delta_r, delta_t);
     delta_t[axis] = 0;
 
         case 1:
           test_precision = 0.0f; // forced end
-          LOOP_XYZ(axis) e_delta[axis] = +Z4(CEN);
+          LOOP_LINEAR_AXES(axis) e_delta[axis] = +Z4(CEN);
           break;
 
         case 2:
       // Normalize angles to least-squares
       if (_angle_results) {
         float a_sum = 0.0f;
-        LOOP_XYZ(axis) a_sum += delta_tower_angle_trim[axis];
-        LOOP_XYZ(axis) delta_tower_angle_trim[axis] -= a_sum / 3.0f;
+        LOOP_LINEAR_AXES(axis) a_sum += delta_tower_angle_trim[axis];
+        LOOP_LINEAR_AXES(axis) delta_tower_angle_trim[axis] -= a_sum / 3.0f;
       }
 
       // adjust delta_height and endstops by the max amount
       const float z_temp = _MAX(delta_endstop_adj.a, delta_endstop_adj.b, delta_endstop_adj.c);
       delta_height -= z_temp;
-      LOOP_XYZ(axis) delta_endstop_adj[axis] -= z_temp;
+      LOOP_LINEAR_AXES(axis) delta_endstop_adj[axis] -= z_temp;
     }
     recalc_delta_settings();
     NOMORE(zero_std_dev_min, zero_std_dev);

Marlin/src/gcode/calibrate/M425.cpp

     }
   };
 
-  LOOP_XYZ(a) {
-    if (axis_can_calibrate(a) && parser.seen(XYZ_CHAR(a))) {
+  LOOP_LINEAR_AXES(a) {
+    if (axis_can_calibrate(a) && parser.seen(AXIS_CHAR(a))) {
       planner.synchronize();
       backlash.distance_mm[a] = parser.has_value() ? parser.value_linear_units() : backlash.get_measurement(AxisEnum(a));
       noArgs = false;
     SERIAL_ECHOLNPGM("active:");
     SERIAL_ECHOLNPAIR("  Correction Amount/Fade-out:     F", backlash.get_correction(), " (F1.0 = full, F0.0 = none)");
     SERIAL_ECHOPGM("  Backlash Distance (mm):        ");
-    LOOP_XYZ(a) if (axis_can_calibrate(a)) {
-      SERIAL_CHAR(' ', XYZ_CHAR(a));
+    LOOP_LINEAR_AXES(a) if (axis_can_calibrate(a)) {
+      SERIAL_CHAR(' ', AXIS_CHAR(a));
       SERIAL_ECHO(backlash.distance_mm[a]);
       SERIAL_EOL();
     }
     #if ENABLED(MEASURE_BACKLASH_WHEN_PROBING)
       SERIAL_ECHOPGM("  Average measured backlash (mm):");
       if (backlash.has_any_measurement()) {
-        LOOP_XYZ(a) if (axis_can_calibrate(a) && backlash.has_measurement(AxisEnum(a))) {
-          SERIAL_CHAR(' ', XYZ_CHAR(a));
+        LOOP_LINEAR_AXES(a) if (axis_can_calibrate(a) && backlash.has_measurement(AxisEnum(a))) {
+          SERIAL_CHAR(' ', AXIS_CHAR(a));
           SERIAL_ECHO(backlash.get_measurement(AxisEnum(a)));
         }
       }

Marlin/src/gcode/calibrate/M666.cpp

    */
   void GcodeSuite::M666() {
     DEBUG_SECTION(log_M666, "M666", DEBUGGING(LEVELING));
-    LOOP_XYZ(i) {
-      if (parser.seen(XYZ_CHAR(i))) {
+    LOOP_LINEAR_AXES(i) {
+      if (parser.seen(AXIS_CHAR(i))) {
         const float v = parser.value_linear_units();
         if (v * Z_HOME_DIR <= 0) delta_endstop_adj[i] = v;
-        if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPAIR("delta_endstop_adj[", AS_CHAR(XYZ_CHAR(i)), "] = ", delta_endstop_adj[i]);
+        if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPAIR("delta_endstop_adj[", AS_CHAR(AXIS_CHAR(i)), "] = ", delta_endstop_adj[i]);
       }
     }
   }

Marlin/src/gcode/calibrate/M852.cpp

 
   // When skew is changed the current position changes
   if (setval) {
-    set_current_from_steppers_for_axis(ALL_AXES);
+    set_current_from_steppers_for_axis(ALL_AXES_MASK);
     sync_plan_position();
     report_current_position();
   }

Marlin/src/gcode/config/M200-M205.cpp

     if (parser.seenval('G')) planner.xy_freq_min_speed_factor = constrain(parser.value_float(), 1, 100) / 100;
   #endif
 
-  LOOP_XYZE(i) {
+  LOOP_LOGICAL_AXES(i) {
     if (parser.seenval(axis_codes[i])) {
       const uint8_t a = (i == E_AXIS ? uint8_t(E_AXIS_N(target_extruder)) : i);
       planner.set_max_acceleration(a, parser.value_axis_units((AxisEnum)a));
   const int8_t target_extruder = get_target_extruder_from_command();
   if (target_extruder < 0) return;
 
-  LOOP_XYZE(i)
+  LOOP_LOGICAL_AXES(i)
     if (parser.seenval(axis_codes[i])) {
       const uint8_t a = (i == E_AXIS ? uint8_t(E_AXIS_N(target_extruder)) : i);
       planner.set_max_feedrate(a, parser.value_axis_units((AxisEnum)a));

Marlin/src/gcode/config/M92.cpp

   if (!parser.seen("XYZE" TERN_(MAGIC_NUMBERS_GCODE, "HL")))
     return report_M92(true, target_extruder);
 
-  LOOP_XYZE(i) {
+  LOOP_LOGICAL_AXES(i) {
     if (parser.seenval(axis_codes[i])) {
       if (i == E_AXIS) {
         const float value = parser.value_per_axis_units((AxisEnum)(E_AXIS_N(target_extruder)));

Marlin/src/gcode/control/M350_M351.cpp

  */
 void GcodeSuite::M350() {
   if (parser.seen('S')) LOOP_LE_N(i, 4) stepper.microstep_mode(i, parser.value_byte());
-  LOOP_XYZE(i) if (parser.seen(axis_codes[i])) stepper.microstep_mode(i, parser.value_byte());
+  LOOP_LOGICAL_AXES(i) if (parser.seen(axis_codes[i])) stepper.microstep_mode(i, parser.value_byte());
   if (parser.seen('B')) stepper.microstep_mode(4, parser.value_byte());
   stepper.microstep_readings();
 }
 void GcodeSuite::M351() {
   if (parser.seenval('S')) switch (parser.value_byte()) {
     case 1:
-      LOOP_XYZE(i) if (parser.seenval(axis_codes[i])) stepper.microstep_ms(i, parser.value_byte(), -1, -1);
+      LOOP_LOGICAL_AXES(i) if (parser.seenval(axis_codes[i])) stepper.microstep_ms(i, parser.value_byte(), -1, -1);
       if (parser.seenval('B')) stepper.microstep_ms(4, parser.value_byte(), -1, -1);
       break;
     case 2:
-      LOOP_XYZE(i) if (parser.seenval(axis_codes[i])) stepper.microstep_ms(i, -1, parser.value_byte(), -1);
+      LOOP_LOGICAL_AXES(i) if (parser.seenval(axis_codes[i])) stepper.microstep_ms(i, -1, parser.value_byte(), -1);
       if (parser.seenval('B')) stepper.microstep_ms(4, -1, parser.value_byte(), -1);
       break;
     case 3:
-      LOOP_XYZE(i) if (parser.seenval(axis_codes[i])) stepper.microstep_ms(i, -1, -1, parser.value_byte());
+      LOOP_LOGICAL_AXES(i) if (parser.seenval(axis_codes[i])) stepper.microstep_ms(i, -1, -1, parser.value_byte());
       if (parser.seenval('B')) stepper.microstep_ms(4, -1, -1, parser.value_byte());
       break;
   }

Marlin/src/gcode/control/M605.cpp

 
         HOTEND_LOOP() {
           DEBUG_ECHOPAIR_P(SP_T_STR, e);
-          LOOP_XYZ(a) DEBUG_ECHOPAIR("  hotend_offset[", e, "].", AS_CHAR(XYZ_CHAR(a) | 0x20), "=", hotend_offset[e][a]);
+          LOOP_LINEAR_AXES(a) DEBUG_ECHOPAIR("  hotend_offset[", e, "].", AS_CHAR(AXIS_CHAR(a) | 0x20), "=", hotend_offset[e][a]);
           DEBUG_EOL();
         }
         DEBUG_EOL();

Marlin/src/gcode/feature/L6470/M906.cpp

     const uint8_t index = parser.byteval('I');
   #endif
 
-  LOOP_XYZE(i) if (uint16_t value = parser.intval(axis_codes[i])) {
+  LOOP_LOGICAL_AXES(i) if (uint16_t value = parser.intval(axis_codes[i])) {
 
     report_current = false;
 

Marlin/src/gcode/feature/digipot/M907-M910.cpp

 void GcodeSuite::M907() {
   #if HAS_MOTOR_CURRENT_SPI
 
-    LOOP_XYZE(i) if (parser.seenval(axis_codes[i])) stepper.set_digipot_current(i, parser.value_int());
+    LOOP_LOGICAL_AXES(i) if (parser.seenval(axis_codes[i])) stepper.set_digipot_current(i, parser.value_int());
     if (parser.seenval('B')) stepper.set_digipot_current(4, parser.value_int());
     if (parser.seenval('S')) LOOP_LE_N(i, 4) stepper.set_digipot_current(i, parser.value_int());
 
 
   #if HAS_MOTOR_CURRENT_I2C
     // this one uses actual amps in floating point
-    LOOP_XYZE(i) if (parser.seenval(axis_codes[i])) digipot_i2c.set_current(i, parser.value_float());
+    LOOP_LOGICAL_AXES(i) if (parser.seenval(axis_codes[i])) digipot_i2c.set_current(i, parser.value_float());
     // Additional extruders use B,C,D for channels 4,5,6.
     // TODO: Change these parameters because 'E' is used. B<index>?
     for (uint8_t i = E_AXIS + 1; i < DIGIPOT_I2C_NUM_CHANNELS; i++)
       const float dac_percent = parser.value_float();
       LOOP_LE_N(i, 4) stepper_dac.set_current_percent(i, dac_percent);
     }
-    LOOP_XYZE(i) if (parser.seenval(axis_codes[i])) stepper_dac.set_current_percent(i, parser.value_float());
+    LOOP_LOGICAL_AXES(i) if (parser.seenval(axis_codes[i])) stepper_dac.set_current_percent(i, parser.value_float());
   #endif
 }
 

Marlin/src/gcode/feature/pause/G61.cpp

   else {
     if (parser.seen("XYZ")) {
       DEBUG_ECHOPAIR(STR_RESTORING_POS " S", slot);
-      LOOP_XYZ(i) {
-        destination[i] = parser.seen(XYZ_CHAR(i))
+      LOOP_LINEAR_AXES(i) {
+        destination[i] = parser.seen(AXIS_CHAR(i))
           ? stored_position[slot][i] + parser.value_axis_units((AxisEnum)i)
           : current_position[i];
-        DEBUG_CHAR(' ', XYZ_CHAR(i));
+        DEBUG_CHAR(' ', AXIS_CHAR(i));
         DEBUG_ECHO_F(destination[i]);
       }
       DEBUG_EOL();

Marlin/src/gcode/feature/trinamic/M122.cpp

  * M122: Debug TMC drivers
  */
 void GcodeSuite::M122() {
-  xyze_bool_t print_axis = ARRAY_N_1(XYZE, false);
+  xyze_bool_t print_axis = ARRAY_N_1(LOGICAL_AXES, false);
 
   bool print_all = true;
-  LOOP_XYZE(i) if (parser.seen(axis_codes[i])) { print_axis[i] = true; print_all = false; }
+  LOOP_LOGICAL_AXES(i) if (parser.seen(axis_codes[i])) { print_axis[i] = true; print_all = false; }
 
-  if (print_all) LOOP_XYZE(i) print_axis[i] = true;
+  if (print_all) LOOP_LOGICAL_AXES(i) print_axis[i] = true;
 
   if (parser.boolval('I')) restore_stepper_drivers();
 

Marlin/src/gcode/feature/trinamic/M569.cpp

     const uint8_t index = parser.byteval('I');
   #endif
 
-  LOOP_XYZE(i) if (parser.seen(axis_codes[i])) {
+  LOOP_LOGICAL_AXES(i) if (parser.seen(axis_codes[i])) {
     switch (i) {
       case X_AXIS:
         #if AXIS_HAS_STEALTHCHOP(X)

Marlin/src/gcode/feature/trinamic/M906.cpp

     const uint8_t index = parser.byteval('I');
   #endif
 
-  LOOP_XYZE(i) if (uint16_t value = parser.intval(axis_codes[i])) {
+  LOOP_LOGICAL_AXES(i) if (uint16_t value = parser.intval(axis_codes[i])) {
     report = false;
     switch (i) {
       case X_AXIS:

Marlin/src/gcode/feature/trinamic/M911-M914.cpp

     #if AXIS_IS_TMC(X) || AXIS_IS_TMC(X2) || AXIS_IS_TMC(Y) || AXIS_IS_TMC(Y2) || AXIS_IS_TMC(Z) || AXIS_IS_TMC(Z2) || AXIS_IS_TMC(Z3) || AXIS_IS_TMC(Z4)
       const uint8_t index = parser.byteval('I');
     #endif
-    LOOP_XYZE(i) if (int32_t value = parser.longval(axis_codes[i])) {
+    LOOP_LOGICAL_AXES(i) if (int32_t value = parser.longval(axis_codes[i])) {
       report = false;
       switch (i) {
         case X_AXIS:
 
     bool report = true;
     const uint8_t index = parser.byteval('I');
-    LOOP_XYZ(i) if (parser.seen(XYZ_CHAR(i))) {
+    LOOP_LINEAR_AXES(i) if (parser.seen(AXIS_CHAR(i))) {
       const int16_t value = parser.value_int();
       report = false;
       switch (i) {

Marlin/src/gcode/gcode.cpp

   #endif
 
   // Get new XYZ position, whether absolute or relative
-  LOOP_XYZ(i) {
-    if ( (seen[i] = parser.seenval(XYZ_CHAR(i))) ) {
+  LOOP_LINEAR_AXES(i) {
+    if ( (seen[i] = parser.seenval(AXIS_CHAR(i))) ) {
       const float v = parser.value_axis_units((AxisEnum)i);
       if (skip_move)
         destination[i] = current_position[i];

Marlin/src/gcode/geometry/G53-G59.cpp

   xyz_float_t new_offset{0};
   if (WITHIN(_new, 0, MAX_COORDINATE_SYSTEMS - 1))
     new_offset = coordinate_system[_new];
-  LOOP_XYZ(i) {
+  LOOP_LINEAR_AXES(i) {
     if (position_shift[i] != new_offset[i]) {
       position_shift[i] = new_offset[i];
       update_workspace_offset((AxisEnum)i);

Marlin/src/gcode/geometry/G92.cpp

 
     #if ENABLED(CNC_COORDINATE_SYSTEMS) && !IS_SCARA
       case 1:                                                         // G92.1 - Zero the Workspace Offset
-        LOOP_XYZ(i) if (position_shift[i]) {
+        LOOP_LINEAR_AXES(i) if (position_shift[i]) {
           position_shift[i] = 0;
           update_workspace_offset((AxisEnum)i);
         }
 
     #if ENABLED(POWER_LOSS_RECOVERY)
       case 9:                                                         // G92.9 - Set Current Position directly (like Marlin 1.0)
-        LOOP_XYZE(i) {
+        LOOP_LOGICAL_AXES(i) {
           if (parser.seenval(axis_codes[i])) {
             if (i == E_AXIS) sync_E = true; else sync_XYZE = true;
             current_position[i] = parser.value_axis_units((AxisEnum)i);
     #endif
 
     case 0:
-      LOOP_XYZE(i) {
+      LOOP_LOGICAL_AXES(i) {
         if (parser.seenval(axis_codes[i])) {
           const float l = parser.value_axis_units((AxisEnum)i),       // Given axis coordinate value, converted to millimeters
                       v = i == E_AXIS ? l : LOGICAL_TO_NATIVE(l, i),  // Axis position in NATIVE space (applying the existing offset)

Marlin/src/gcode/geometry/M206_M428.cpp

  * ***              In the 2.0 release, it will simply be disabled by default.
  */
 void GcodeSuite::M206() {
-  LOOP_XYZ(i)
-    if (parser.seen(XYZ_CHAR(i)))
+  LOOP_LINEAR_AXES(i)
+    if (parser.seen(AXIS_CHAR(i)))
       set_home_offset((AxisEnum)i, parser.value_linear_units());
 
   #if ENABLED(MORGAN_SCARA)
   if (homing_needed_error()) return;
 
   xyz_float_t diff;
-  LOOP_XYZ(i) {
+  LOOP_LINEAR_AXES(i) {
     diff[i] = base_home_pos((AxisEnum)i) - current_position[i];
     if (!WITHIN(diff[i], -20, 20) && home_dir((AxisEnum)i) > 0)
       diff[i] = -current_position[i];
     }
   }
 
-  LOOP_XYZ(i) set_home_offset((AxisEnum)i, diff[i]);
+  LOOP_LINEAR_AXES(i) set_home_offset((AxisEnum)i, diff[i]);
   report_current_position();
   LCD_MESSAGEPGM(MSG_HOME_OFFSETS_APPLIED);
   BUZZ(100, 659);

Marlin/src/gcode/host/M114.cpp

 
   void report_linear_axis_pos(const xyz_pos_t &pos, const uint8_t precision=3) {
     char str[12];
-    LOOP_XYZ(a) {
-      SERIAL_CHAR(' ', XYZ_CHAR(a), ':');
+    LOOP_LINEAR_AXES(a) {
+      SERIAL_CHAR(' ', AXIS_CHAR(a), ':');
       SERIAL_ECHO(dtostrf(pos[a], 1, precision, str));
     }
     SERIAL_EOL();
     #endif // HAS_L64XX
 
     SERIAL_ECHOPGM("Stepper:");
-    LOOP_XYZE(i) {
+    LOOP_LOGICAL_AXES(i) {
       SERIAL_CHAR(' ', axis_codes[i], ':');
       SERIAL_ECHO(stepper.position((AxisEnum)i));
     }

Marlin/src/gcode/motion/M290.cpp

  */
 void GcodeSuite::M290() {
   #if ENABLED(BABYSTEP_XY)
-    LOOP_XYZ(a)
-      if (parser.seenval(XYZ_CHAR(a)) || (a == Z_AXIS && parser.seenval('S'))) {
+    LOOP_LINEAR_AXES(a)
+      if (parser.seenval(AXIS_CHAR(a)) || (a == Z_AXIS && parser.seenval('S'))) {
         const float offs = constrain(parser.value_axis_units((AxisEnum)a), -2, 2);
         babystep.add_mm((AxisEnum)a, offs);
         #if ENABLED(BABYSTEP_ZPROBE_OFFSET)

Marlin/src/gcode/probe/G38.cpp

   planner.synchronize();
   G38_move = 0;
   endstops.hit_on_purpose();
-  set_current_from_steppers_for_axis(ALL_AXES);
+  set_current_from_steppers_for_axis(ALL_AXES_MASK);
   sync_plan_position();
 }
 
   #if MULTIPLE_PROBING > 1
     // Get direction of move and retract
     xyz_float_t retract_mm;
-    LOOP_XYZ(i) {
+    LOOP_LINEAR_AXES(i) {
       const float dist = destination[i] - current_position[i];
       retract_mm[i] = ABS(dist) < G38_MINIMUM_MOVE ? 0 : home_bump_mm((AxisEnum)i) * (dist > 0 ? -1 : 1);
     }
   ;
 
   // If any axis has enough movement, do the move
-  LOOP_XYZ(i)
+  LOOP_LINEAR_AXES(i)
     if (ABS(destination[i] - current_position[i]) >= G38_MINIMUM_MOVE) {
       if (!parser.seenval('F')) feedrate_mm_s = homing_feedrate((AxisEnum)i);
       // If G38.2 fails throw an error

Marlin/src/inc/Conditionals_LCD.h

 #endif
 
 /**
- * DISTINCT_E_FACTORS affects how some E factors are accessed
+ * Number of Linear Axes (e.g., XYZ)
+ * All the logical axes except for the tool (E) axis
+ */
+#ifndef LINEAR_AXES
+  #define LINEAR_AXES XYZ
+#endif
+
+/**
+ * Number of Logical Axes (e.g., XYZE)
+ * All the logical axes that can be commanded directly by G-code.
+ * Delta maps stepper-specific values to ABC steppers.
+ */
+#if EXTRUDERS
+  #define LOGICAL_AXES INCREMENT(LINEAR_AXES)
+#else
+  #define LOGICAL_AXES LINEAR_AXES
+#endif
+
+/**
+ * DISTINCT_E_FACTORS affects whether Extruders use different settings
  */
 #if ENABLED(DISTINCT_E_FACTORS) && E_STEPPERS > 1
   #define DISTINCT_E E_STEPPERS
-  #define XYZE_N (XYZ + E_STEPPERS)
+  #define DISTINCT_AXES (LINEAR_AXES + E_STEPPERS)
   #define E_INDEX_N(E) (E)
-  #define E_AXIS_N(E) AxisEnum(E_AXIS + E)
-  #define UNUSED_E(E) NOOP
 #else
   #undef DISTINCT_E_FACTORS
   #define DISTINCT_E 1
-  #define XYZE_N XYZE
+  #define DISTINCT_AXES LOGICAL_AXES
   #define E_INDEX_N(E) 0
-  #define E_AXIS_N(E) E_AXIS
-  #define UNUSED_E(E) UNUSED(E)
 #endif
+#define E_AXIS_N(E) AxisEnum(E_AXIS + E_INDEX_N(E))
 
 /**
  * The BLTouch Probe emulates a servo probe

Marlin/src/inc/SanityCheck.h

   #define _EXTRA_NOTE ""
 #endif
 
-static_assert(COUNT(sanity_arr_1) >= XYZE,   "DEFAULT_AXIS_STEPS_PER_UNIT requires X, Y, Z and E elements.");
-static_assert(COUNT(sanity_arr_1) <= XYZE_N, "DEFAULT_AXIS_STEPS_PER_UNIT has too many elements." _EXTRA_NOTE);
+static_assert(COUNT(sanity_arr_1) >= LOGICAL_AXES,  "DEFAULT_AXIS_STEPS_PER_UNIT requires X, Y, Z and E elements.");
+static_assert(COUNT(sanity_arr_1) <= DISTINCT_AXES, "DEFAULT_AXIS_STEPS_PER_UNIT has too many elements." _EXTRA_NOTE);
 static_assert(   _ARR_TEST(1,0) && _ARR_TEST(1,1) && _ARR_TEST(1,2)
               && _ARR_TEST(1,3) && _ARR_TEST(1,4) && _ARR_TEST(1,5)
               && _ARR_TEST(1,6) && _ARR_TEST(1,7) && _ARR_TEST(1,8),
               "DEFAULT_AXIS_STEPS_PER_UNIT values must be positive.");
 
-static_assert(COUNT(sanity_arr_2) >= XYZE,   "DEFAULT_MAX_FEEDRATE requires X, Y, Z and E elements.");
-static_assert(COUNT(sanity_arr_2) <= XYZE_N, "DEFAULT_MAX_FEEDRATE has too many elements." _EXTRA_NOTE);
+static_assert(COUNT(sanity_arr_2) >= LOGICAL_AXES,  "DEFAULT_MAX_FEEDRATE requires X, Y, Z and E elements.");
+static_assert(COUNT(sanity_arr_2) <= DISTINCT_AXES, "DEFAULT_MAX_FEEDRATE has too many elements." _EXTRA_NOTE);
 static_assert(   _ARR_TEST(2,0) && _ARR_TEST(2,1) && _ARR_TEST(2,2)
               && _ARR_TEST(2,3) && _ARR_TEST(2,4) && _ARR_TEST(2,5)
               && _ARR_TEST(2,6) && _ARR_TEST(2,7) && _ARR_TEST(2,8),
               "DEFAULT_MAX_FEEDRATE values must be positive.");
 
-static_assert(COUNT(sanity_arr_3) >= XYZE,   "DEFAULT_MAX_ACCELERATION requires X, Y, Z and E elements.");
-static_assert(COUNT(sanity_arr_3) <= XYZE_N, "DEFAULT_MAX_ACCELERATION has too many elements." _EXTRA_NOTE);
+static_assert(COUNT(sanity_arr_3) >= LOGICAL_AXES,  "DEFAULT_MAX_ACCELERATION requires X, Y, Z and E elements.");
+static_assert(COUNT(sanity_arr_3) <= DISTINCT_AXES, "DEFAULT_MAX_ACCELERATION has too many elements." _EXTRA_NOTE);
 static_assert(   _ARR_TEST(3,0) && _ARR_TEST(3,1) && _ARR_TEST(3,2)
               && _ARR_TEST(3,3) && _ARR_TEST(3,4) && _ARR_TEST(3,5)
               && _ARR_TEST(3,6) && _ARR_TEST(3,7) && _ARR_TEST(3,8),
 #if ENABLED(LIMITED_MAX_ACCEL_EDITING)
   #ifdef MAX_ACCEL_EDIT_VALUES
     constexpr float sanity_arr_4[] = MAX_ACCEL_EDIT_VALUES;
-    static_assert(COUNT(sanity_arr_4) >= XYZE, "MAX_ACCEL_EDIT_VALUES requires X, Y, Z and E elements.");
-    static_assert(COUNT(sanity_arr_4) <= XYZE, "MAX_ACCEL_EDIT_VALUES has too many elements. X, Y, Z and E elements only.");
+    static_assert(COUNT(sanity_arr_4) >= LOGICAL_AXES, "MAX_ACCEL_EDIT_VALUES requires X, Y, Z and E elements.");
+    static_assert(COUNT(sanity_arr_4) <= LOGICAL_AXES, "MAX_ACCEL_EDIT_VALUES has too many elements. X, Y, Z and E elements only.");
     static_assert(   _ARR_TEST(4,0) && _ARR_TEST(4,1) && _ARR_TEST(4,2)
                   && _ARR_TEST(4,3) && _ARR_TEST(4,4) && _ARR_TEST(4,5)
                   && _ARR_TEST(4,6) && _ARR_TEST(4,7) && _ARR_TEST(4,8),
 #if ENABLED(LIMITED_MAX_FR_EDITING)
   #ifdef MAX_FEEDRATE_EDIT_VALUES
     constexpr float sanity_arr_5[] = MAX_FEEDRATE_EDIT_VALUES;
-    static_assert(COUNT(sanity_arr_5) >= XYZE, "MAX_FEEDRATE_EDIT_VALUES requires X, Y, Z and E elements.");
-    static_assert(COUNT(sanity_arr_5) <= XYZE, "MAX_FEEDRATE_EDIT_VALUES has too many elements. X, Y, Z and E elements only.");
+    static_assert(COUNT(sanity_arr_5) >= LOGICAL_AXES, "MAX_FEEDRATE_EDIT_VALUES requires X, Y, Z and E elements.");
+    static_assert(COUNT(sanity_arr_5) <= LOGICAL_AXES, "MAX_FEEDRATE_EDIT_VALUES has too many elements. X, Y, Z and E elements only.");
     static_assert(   _ARR_TEST(5,0) && _ARR_TEST(5,1) && _ARR_TEST(5,2)
                   && _ARR_TEST(5,3) && _ARR_TEST(5,4) && _ARR_TEST(5,5)
                   && _ARR_TEST(5,6) && _ARR_TEST(5,7) && _ARR_TEST(5,8),
 #if ENABLED(LIMITED_JERK_EDITING)
   #ifdef MAX_JERK_EDIT_VALUES
     constexpr float sanity_arr_6[] = MAX_JERK_EDIT_VALUES;
-    static_assert(COUNT(sanity_arr_6) >= XYZE, "MAX_JERK_EDIT_VALUES requires X, Y, Z and E elements.");
-    static_assert(COUNT(sanity_arr_6) <= XYZE, "MAX_JERK_EDIT_VALUES has too many elements. X, Y, Z and E elements only.");
+    static_assert(COUNT(sanity_arr_6) >= LOGICAL_AXES, "MAX_JERK_EDIT_VALUES requires X, Y, Z and E elements.");
+    static_assert(COUNT(sanity_arr_6) <= LOGICAL_AXES, "MAX_JERK_EDIT_VALUES has too many elements. X, Y, Z and E elements only.");
     static_assert(   _ARR_TEST(6,0) && _ARR_TEST(6,1) && _ARR_TEST(6,2)
                   && _ARR_TEST(6,3) && _ARR_TEST(6,4) && _ARR_TEST(6,5)
                   && _ARR_TEST(6,6) && _ARR_TEST(6,7) && _ARR_TEST(6,8),

Marlin/src/lcd/marlinui.cpp

   #if ENABLED(MULTI_MANUAL)
     int8_t ManualMove::e_index = 0;
   #endif
-  AxisEnum ManualMove::axis = NO_AXIS;
+  AxisEnum ManualMove::axis = NO_AXIS_MASK;
 
   /**
    * If a manual move has been posted and its time has arrived, and if the planner
    *
    * To post a manual move:
    *   - Update current_position to the new place you want to go.
-   *   - Set manual_move.axis to an axis like X_AXIS. Use ALL_AXES for diagonal moves.
+   *   - Set manual_move.axis to an axis like X_AXIS. Use ALL_AXES_MASK for diagonal moves.
    *   - Set manual_move.start_time to a point in the future (in ms) when the move should be done.
    *
    * For kinematic machines:
     if (processing) return;   // Prevent re-entry from idle() calls
 
     // Add a manual move to the queue?
-    if (axis != NO_AXIS && ELAPSED(millis(), start_time) && !planner.is_full()) {
+    if (axis != NO_AXIS_MASK && ELAPSED(millis(), start_time) && !planner.is_full()) {
 
       const feedRate_t fr_mm_s = (axis <= E_AXIS) ? manual_feedrate_mm_s[axis] : XY_PROBE_FEEDRATE_MM_S;
 
         #endif
 
         // Apply a linear offset to a single axis
-        if (axis == ALL_AXES)
+        if (axis == ALL_AXES_MASK)
           destination = all_axes_destination;
         else if (axis <= XYZE) {
           destination = current_position;
 
         // Reset for the next move
         offset = 0;
-        axis = NO_AXIS;
+        axis = NO_AXIS_MASK;
 
         // DELTA and SCARA machines use segmented moves, which could fill the planner during the call to
         // move_to_destination. This will cause idle() to be called, which can then call this function while the
 
         //SERIAL_ECHOLNPAIR("Add planner.move with Axis ", AS_CHAR(axis_codes[axis]), " at FR ", fr_mm_s);
 
-        axis = NO_AXIS;
+        axis = NO_AXIS_MASK;
 
       #endif
     }

Marlin/src/lcd/menu/menu_advanced.cpp

 
   void menu_dac() {
     static xyze_uint8_t driverPercent;
-    LOOP_XYZE(i) driverPercent[i] = stepper_dac.get_current_percent((AxisEnum)i);
+    LOOP_LOGICAL_AXES(i) driverPercent[i] = stepper_dac.get_current_percent((AxisEnum)i);
     START_MENU();
     BACK_ITEM(MSG_ADVANCED_SETTINGS);
     #define EDIT_DAC_PERCENT(A) EDIT_ITEM(uint8, MSG_DAC_PERCENT_##A, &driverPercent[_AXIS(A)], 0, 100, []{ stepper_dac.set_current_percents(driverPercent); })

Marlin/src/lcd/menu/menu_bed_leveling.cpp

 #if ENABLED(MESH_EDIT_MENU)
 
   inline void refresh_planner() {
-    set_current_from_steppers_for_axis(ALL_AXES);
+    set_current_from_steppers_for_axis(ALL_AXES_MASK);
     sync_plan_position();
   }
 

Marlin/src/lcd/menu/menu_ubl.cpp

 
   // Use the built-in manual move handler to move to the mesh point.
   ui.manual_move.set_destination(xy);
-  ui.manual_move.soon(ALL_AXES);
+  ui.manual_move.soon(ALL_AXES_MASK);
 }
 
 inline int32_t grid_index(const uint8_t x, const uint8_t y) {

Marlin/src/libs/L64XX/L64XX_Marlin.cpp

   }
 
   uint8_t found_displacement = false;
-  LOOP_XYZE(i) if (uint16_t _displacement = parser.intval(axis_codes[i])) {
+  LOOP_LOGICAL_AXES(i) if (uint16_t _displacement = parser.intval(axis_codes[i])) {
     found_displacement = true;
     displacement = _displacement;
     uint8_t axis_offset = parser.byteval('J');

Marlin/src/module/motion.cpp

       "Offsets for the first hotend must be 0.0."
     );
     // Transpose from [XYZ][HOTENDS] to [HOTENDS][XYZ]
-    HOTEND_LOOP() LOOP_XYZ(a) hotend_offset[e][a] = tmp[a][e];
+    HOTEND_LOOP() LOOP_LINEAR_AXES(a) hotend_offset[e][a] = tmp[a][e];
     #if ENABLED(DUAL_X_CARRIAGE)
       hotend_offset[1].x = _MAX(X2_HOME_POS, X2_MAX_POS);
     #endif
 void quickstop_stepper() {
   planner.quick_stop();
   planner.synchronize();
-  set_current_from_steppers_for_axis(ALL_AXES);
+  set_current_from_steppers_for_axis(ALL_AXES_MASK);
   sync_plan_position();
 }
 
     planner.unapply_modifiers(pos, true);
   #endif
 
-  if (axis == ALL_AXES)
+  if (axis == ALL_AXES_MASK)
     current_position = pos;
   else
     current_position[axis] = pos[axis];
     #endif
 
     if (DEBUGGING(LEVELING))
-      SERIAL_ECHOLNPAIR("Axis ", AS_CHAR(XYZ_CHAR(axis)), " min:", soft_endstop.min[axis], " max:", soft_endstop.max[axis]);
+      SERIAL_ECHOLNPAIR("Axis ", AS_CHAR(AXIS_CHAR(axis)), " min:", soft_endstop.min[axis], " max:", soft_endstop.max[axis]);
   }
 
   /**
 #if HAS_WORKSPACE_OFFSET
   void update_workspace_offset(const AxisEnum axis) {
     workspace_offset[axis] = home_offset[axis] + position_shift[axis];
-    if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPAIR("Axis ", AS_CHAR(XYZ_CHAR(axis)), " home_offset = ", home_offset[axis], " position_shift = ", position_shift[axis]);
+    if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPAIR("Axis ", AS_CHAR(AXIS_CHAR(axis)), " home_offset = ", home_offset[axis], " position_shift = ", position_shift[axis]);
   }
 #endif
 

Marlin/src/module/planner.cpp

   laser_state_t Planner::laser_inline;          // Current state for blocks
 #endif
 
-uint32_t Planner::max_acceleration_steps_per_s2[XYZE_N]; // (steps/s^2) Derived from mm_per_s2
+uint32_t Planner::max_acceleration_steps_per_s2[DISTINCT_AXES]; // (steps/s^2) Derived from mm_per_s2
 
-float Planner::steps_to_mm[XYZE_N];             // (mm) Millimeters per step
+float Planner::steps_to_mm[DISTINCT_AXES];      // (mm) Millimeters per step
 
 #if HAS_JUNCTION_DEVIATION
   float Planner::junction_deviation_mm;         // (mm) M205 J
   float speed_factor = 1.0f; // factor <1 decreases speed
 
   // Linear axes first with less logic
-  LOOP_XYZ(i) {
+  LOOP_LINEAR_AXES(i) {
     current_speed[i] = steps_dist_mm[i] * inverse_secs;
     const feedRate_t cs = ABS(current_speed[i]),
                  max_fr = settings.max_feedrate_mm_s[i];
     const float extra_xyjerk = (de <= 0) ? TRAVEL_EXTRA_XYJERK : 0;
 
     uint8_t limited = 0;
-    TERN(HAS_LINEAR_E_JERK, LOOP_XYZ, LOOP_XYZE)(i) {
+    TERN(HAS_LINEAR_E_JERK, LOOP_LINEAR_AXES, LOOP_LOGICAL_AXES)(i) {
       const float jerk = ABS(current_speed[i]),   // cs : Starting from zero, change in speed for this axis
                   maxj = (max_jerk[i] + (i == X_AXIS || i == Y_AXIS ? extra_xyjerk : 0.0f)); // mj : The max jerk setting for this axis
       if (jerk > maxj) {                          // cs > mj : New current speed too fast?
         vmax_junction = previous_nominal_speed;
 
       // Now limit the jerk in all axes.
-      TERN(HAS_LINEAR_E_JERK, LOOP_XYZ, LOOP_XYZE)(axis) {
+      TERN(HAS_LINEAR_E_JERK, LOOP_LINEAR_AXES, LOOP_LOGICAL_AXES)(axis) {
         // Limit an axis. We have to differentiate: coasting, reversal of an axis, full stop.
         float v_exit = previous_speed[axis] * smaller_speed_factor,
               v_entry = current_speed[axis];
     #define AXIS_CONDITION true
   #endif
   uint32_t highest_rate = 1;
-  LOOP_XYZE_N(i) {
+  LOOP_DISTINCT_AXES(i) {
     max_acceleration_steps_per_s2[i] = settings.max_acceleration_mm_per_s2[i] * settings.axis_steps_per_mm[i];
     if (AXIS_CONDITION) NOLESS(highest_rate, max_acceleration_steps_per_s2[i]);
   }
  * Must be called whenever settings.axis_steps_per_mm changes!
  */
 void Planner::refresh_positioning() {
-  LOOP_XYZE_N(i) steps_to_mm[i] = 1.0f / settings.axis_steps_per_mm[i];
+  LOOP_DISTINCT_AXES(i) steps_to_mm[i] = 1.0f / settings.axis_steps_per_mm[i];
   set_position_mm(current_position);
   reset_acceleration_rates();
 }

Marlin/src/module/planner.h

 #endif
 
 typedef struct {
-   uint32_t max_acceleration_mm_per_s2[XYZE_N], // (mm/s^2) M201 XYZE
+   uint32_t max_acceleration_mm_per_s2[DISTINCT_AXES], // (mm/s^2) M201 XYZE
             min_segment_time_us;                // (µs) M205 B
-      float axis_steps_per_mm[XYZE_N];          // (steps) M92 XYZE - Steps per millimeter
- feedRate_t max_feedrate_mm_s[XYZE_N];          // (mm/s) M203 XYZE - Max speeds
+      float axis_steps_per_mm[DISTINCT_AXES];   // (steps) M92 XYZE - Steps per millimeter
+ feedRate_t max_feedrate_mm_s[DISTINCT_AXES];   // (mm/s) M203 XYZE - Max speeds
       float acceleration,                       // (mm/s^2) M204 S - Normal acceleration. DEFAULT ACCELERATION for all printing moves.
             retract_acceleration,               // (mm/s^2) M204 R - Retract acceleration. Filament pull-back and push-forward while standing still in the other axes
             travel_acceleration;                // (mm/s^2) M204 T - Travel acceleration. DEFAULT ACCELERATION for all NON printing moves.
       static laser_state_t laser_inline;
     #endif
 
-    static uint32_t max_acceleration_steps_per_s2[XYZE_N]; // (steps/s^2) Derived from mm_per_s2
-    static float steps_to_mm[XYZE_N];           // Millimeters per step
+    static uint32_t max_acceleration_steps_per_s2[DISTINCT_AXES]; // (steps/s^2) Derived from mm_per_s2
+    static float steps_to_mm[DISTINCT_AXES];          // Millimeters per step
 
     #if HAS_JUNCTION_DEVIATION
-      static float junction_deviation_mm;       // (mm) M205 J
+      static float junction_deviation_mm;             // (mm) M205 J
       #if HAS_LINEAR_E_JERK
-        static float max_e_jerk[DISTINCT_E];    // Calculated from junction_deviation_mm
+        static float max_e_jerk[DISTINCT_E];          // Calculated from junction_deviation_mm
       #endif
     #endif
 
 
       FORCE_INLINE static void normalize_junction_vector(xyze_float_t &vector) {
         float magnitude_sq = 0;
-        LOOP_XYZE(idx) if (vector[idx]) magnitude_sq += sq(vector[idx]);
+        LOOP_LOGICAL_AXES(idx) if (vector[idx]) magnitude_sq += sq(vector[idx]);
         vector *= RSQRT(magnitude_sq);
       }
 
       FORCE_INLINE static float limit_value_by_axis_maximum(const_float_t max_value, xyze_float_t &unit_vec) {
         float limit_value = max_value;
-        LOOP_XYZE(idx) {
+        LOOP_LOGICAL_AXES(idx) {
           if (unit_vec[idx]) {
             if (limit_value * ABS(unit_vec[idx]) > settings.max_acceleration_mm_per_s2[idx])
               limit_value = ABS(settings.max_acceleration_mm_per_s2[idx] / unit_vec[idx]);

Marlin/src/module/scara.cpp

     // Do this here all at once for Delta, because
     // XYZ isn't ABC. Applying this per-tower would
     // give the impression that they are the same.
-    LOOP_XYZ(i) set_axis_is_at_home((AxisEnum)i);
+    LOOP_LINEAR_AXES(i) set_axis_is_at_home((AxisEnum)i);
 
     sync_plan_position();
   }

Marlin/src/module/settings.cpp

   //
   // DISTINCT_E_FACTORS
   //
-  uint8_t   esteppers;                                  // XYZE_N - XYZ
+  uint8_t   esteppers;                                  // DISTINCT_AXES - LINEAR_AXES
 
   planner_settings_t planner_settings;
 
   // HAS_MOTOR_CURRENT_PWM
   //
   #ifndef MOTOR_CURRENT_COUNT
-    #define MOTOR_CURRENT_COUNT 3
+    #define MOTOR_CURRENT_COUNT LINEAR_AXES
   #endif
   uint32_t motor_current_setting[MOTOR_CURRENT_COUNT];  // M907 X Z E
 
   #endif
 
   // Software endstops depend on home_offset
-  LOOP_XYZ(i) {
+  LOOP_LINEAR_AXES(i) {
     update_workspace_offset((AxisEnum)i);
     update_software_endstops((AxisEnum)i);
   }
 
     working_crc = 0; // clear before first "real data"
 
+    const uint8_t esteppers = COUNT(planner.settings.axis_steps_per_mm) - LINEAR_AXES;
     _FIELD_TEST(esteppers);
-
-    const uint8_t esteppers = COUNT(planner.settings.axis_steps_per_mm) - XYZ;
     EEPROM_WRITE(esteppers);
 
     //
       {
         // Get only the number of E stepper parameters previously stored
         // Any steppers added later are set to their defaults
-        uint32_t tmp1[XYZ + esteppers];
-        float tmp2[XYZ + esteppers];
-        feedRate_t tmp3[XYZ + esteppers];
+        uint32_t tmp1[LINEAR_AXES + esteppers];
+        float tmp2[LINEAR_AXES + esteppers];
+        feedRate_t tmp3[LINEAR_AXES + esteppers];
         EEPROM_READ((uint8_t *)tmp1, sizeof(tmp1)); // max_acceleration_mm_per_s2
         EEPROM_READ(planner.settings.min_segment_time_us);
         EEPROM_READ((uint8_t *)tmp2, sizeof(tmp2)); // axis_steps_per_mm
         EEPROM_READ((uint8_t *)tmp3, sizeof(tmp3)); // max_feedrate_mm_s
 
-        if (!validating) LOOP_XYZE_N(i) {
-          const bool in = (i < esteppers + XYZ);
+        if (!validating) LOOP_DISTINCT_AXES(i) {
+          const bool in = (i < esteppers + LINEAR_AXES);
           planner.settings.max_acceleration_mm_per_s2[i] = in ? tmp1[i] : pgm_read_dword(&_DMA[ALIM(i, _DMA)]);
           planner.settings.axis_steps_per_mm[i]          = in ? tmp2[i] : pgm_read_float(&_DASU[ALIM(i, _DASU)]);
           planner.settings.max_feedrate_mm_s[i]          = in ? tmp3[i] : pgm_read_float(&_DMF[ALIM(i, _DMF)]);
             EEPROM_READ(dummyf);
           #endif
         #else
-          for (uint8_t q = XYZE; q--;) EEPROM_READ(dummyf);
+          for (uint8_t q = LOGICAL_AXES; q--;) EEPROM_READ(dummyf);
         #endif
 
         EEPROM_READ(TERN(CLASSIC_JERK, dummyf, planner.junction_deviation_mm));
  * M502 - Reset Configuration
  */
 void MarlinSettings::reset() {
-  LOOP_XYZE_N(i) {
+  LOOP_DISTINCT_AXES(i) {
     planner.settings.max_acceleration_mm_per_s2[i] = pgm_read_dword(&_DMA[ALIM(i, _DMA)]);
     planner.settings.axis_steps_per_mm[i] = pgm_read_float(&_DASU[ALIM(i, _DASU)]);
     planner.settings.max_feedrate_mm_s[i] = pgm_read_float(&_DMF[ALIM(i, _DMF)]);
     constexpr float dpo[] = NOZZLE_TO_PROBE_OFFSET;
     static_assert(COUNT(dpo) == 3, "NOZZLE_TO_PROBE_OFFSET must contain offsets for X, Y, and Z.");
     #if HAS_PROBE_XY_OFFSET
-      LOOP_XYZ(a) probe.offset[a] = dpo[a];
+      LOOP_LINEAR_AXES(a) probe.offset[a] = dpo[a];
     #else
       probe.offset.set(0, 0, dpo[Z_AXIS]);
     #endif
         );
       #elif HAS_MOTOR_CURRENT_SPI
         SERIAL_ECHOPGM("  M907");                              // SPI-based has 5 values:
-        LOOP_XYZE(q) {                                         // X Y Z E (map to X Y Z E0 by default)
+        LOOP_LOGICAL_AXES(q) {                                 // X Y Z E (map to X Y Z E0 by default)
           SERIAL_CHAR(' ', axis_codes[q]);
           SERIAL_ECHO(stepper.motor_current_setting[q]);
         }

Marlin/src/module/stepper.h

         #ifndef PWM_MOTOR_CURRENT
           #define PWM_MOTOR_CURRENT DEFAULT_PWM_MOTOR_CURRENT
         #endif
-        #define MOTOR_CURRENT_COUNT XYZ
+        #define MOTOR_CURRENT_COUNT LINEAR_AXES
       #elif HAS_MOTOR_CURRENT_SPI
         static constexpr uint32_t digipot_count[] = DIGIPOT_MOTOR_CURRENT;
         #define MOTOR_CURRENT_COUNT COUNT(Stepper::digipot_count)

Marlin/src/module/tool_change.cpp

       sync_plan_position();
 
       #if ENABLED(DELTA)
-        //LOOP_XYZ(i) update_software_endstops(i); // or modify the constrain function
+        //LOOP_LINEAR_AXES(i) update_software_endstops(i); // or modify the constrain function
         const bool safe_to_move = current_position.z < delta_clip_start_height - 1;
       #else
         constexpr bool safe_to_move = true;