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diff --git a/Marlin/src/gcode/calibrate/G34.cpp b/Marlin/src/gcode/calibrate/G34.cpp
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "../../inc/MarlinConfigPre.h"
+
+#if ENABLED(MECHANICAL_GANTRY_CALIBRATION)
+
+#include "../gcode.h"
+#include "../../module/motion.h"
+#include "../../module/stepper.h"
+#include "../../module/endstops.h"
+
+#if HAS_LEVELING
+  #include "../../feature/bedlevel/bedlevel.h"
+#endif
+
+#define DEBUG_OUT ENABLED(DEBUG_LEVELING_FEATURE)
+#include "../../core/debug_out.h"
+
+void GcodeSuite::G34() {
+
+  // Home before the alignment procedure
+  if (!all_axes_trusted()) home_all_axes();
+
+  TERN_(HAS_LEVELING, TEMPORARY_BED_LEVELING_STATE(false));
+
+  SET_SOFT_ENDSTOP_LOOSE(true);
+  TemporaryGlobalEndstopsState unlock_z(false);
+
+  #ifdef GANTRY_CALIBRATION_COMMANDS_PRE
+    gcode.process_subcommands_now_P(PSTR(GANTRY_CALIBRATION_COMMANDS_PRE));
+    if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("Sub Commands Processed");
+  #endif
+
+  #ifdef GANTRY_CALIBRATION_SAFE_POSITION
+    // Move XY to safe position
+    if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("Parking XY");
+    const xy_pos_t safe_pos = GANTRY_CALIBRATION_SAFE_POSITION;
+    do_blocking_move_to(safe_pos, MMM_TO_MMS(GANTRY_CALIBRATION_XY_PARK_FEEDRATE));
+  #endif
+
+  const float move_distance = parser.intval('Z', GANTRY_CALIBRATION_EXTRA_HEIGHT),
+              zbase = ENABLED(GANTRY_CALIBRATION_TO_MIN) ? Z_MIN_POS : Z_MAX_POS,
+              zpounce = zbase - move_distance, zgrind = zbase + move_distance;
+
+  // Move Z to pounce position
+  if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("Setting Z Pounce");
+  do_blocking_move_to_z(zpounce, homing_feedrate(Z_AXIS));
+
+  // Store current motor settings, then apply reduced value
+
+  #define _REDUCE_CURRENT ANY(HAS_MOTOR_CURRENT_SPI, HAS_MOTOR_CURRENT_PWM, HAS_MOTOR_CURRENT_DAC, HAS_MOTOR_CURRENT_I2C, HAS_TRINAMIC_CONFIG)
+  #if _REDUCE_CURRENT
+    if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("Reducing Current");
+  #endif
+
+  #if HAS_MOTOR_CURRENT_SPI
+    const uint16_t target_current = parser.intval('S', GANTRY_CALIBRATION_CURRENT);
+    const uint32_t previous_current = stepper.motor_current_setting[Z_AXIS];
+    stepper.set_digipot_current(Z_AXIS, target_current);
+  #elif HAS_MOTOR_CURRENT_PWM
+    const uint16_t target_current = parser.intval('S', GANTRY_CALIBRATION_CURRENT);
+    const uint32_t previous_current = stepper.motor_current_setting[Z_AXIS];
+    stepper.set_digipot_current(1, target_current);
+  #elif ENABLED(HAS_MOTOR_CURRENT_DAC)
+    const float target_current = parser.floatval('S', GANTRY_CALIBRATION_CURRENT);
+    const float previous_current = dac_amps(Z_AXIS, target_current);
+    stepper_dac.set_current_value(Z_AXIS, target_current);
+  #elif ENABLED(HAS_MOTOR_CURRENT_I2C)
+    const uint16_t target_current = parser.intval('S', GANTRY_CALIBRATION_CURRENT);
+    previous_current = dac_amps(Z_AXIS);
+    digipot_i2c.set_current(Z_AXIS, target_current)
+  #elif HAS_TRINAMIC_CONFIG
+    const uint16_t target_current = parser.intval('S', GANTRY_CALIBRATION_CURRENT);
+    static uint16_t previous_current_arr[NUM_Z_STEPPER_DRIVERS];
+    #if AXIS_IS_TMC(Z)
+      previous_current_arr[0] = stepperZ.getMilliamps();
+      stepperZ.rms_current(target_current);
+    #endif
+    #if AXIS_IS_TMC(Z2)
+      previous_current_arr[1] = stepperZ2.getMilliamps();
+      stepperZ2.rms_current(target_current);
+    #endif
+    #if AXIS_IS_TMC(Z3)
+      previous_current_arr[2] = stepperZ3.getMilliamps();
+      stepperZ3.rms_current(target_current);
+    #endif
+    #if AXIS_IS_TMC(Z4)
+      previous_current_arr[3] = stepperZ4.getMilliamps();
+      stepperZ4.rms_current(target_current);
+    #endif
+  #endif
+
+  // Do Final Z move to adjust
+  if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("Final Z Move");
+  do_blocking_move_to_z(zgrind, MMM_TO_MMS(GANTRY_CALIBRATION_FEEDRATE));
+
+  // Back off end plate, back to normal motion range
+  if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("Z Backoff");
+  do_blocking_move_to_z(zpounce, MMM_TO_MMS(GANTRY_CALIBRATION_FEEDRATE));
+
+  #if _REDUCE_CURRENT
+    // Reset current to original values
+    if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("Restore Current");
+  #endif
+
+  #if HAS_MOTOR_CURRENT_SPI
+    stepper.set_digipot_current(Z_AXIS, previous_current);
+  #elif HAS_MOTOR_CURRENT_PWM
+    stepper.set_digipot_current(1, previous_current);
+  #elif ENABLED(HAS_MOTOR_CURRENT_DAC)
+    stepper_dac.set_current_value(Z_AXIS, previous_current);
+  #elif ENABLED(HAS_MOTOR_CURRENT_I2C)
+    digipot_i2c.set_current(Z_AXIS, previous_current)
+  #elif HAS_TRINAMIC_CONFIG
+    #if AXIS_IS_TMC(Z)
+      stepperZ.rms_current(previous_current_arr[0]);
+    #endif
+    #if AXIS_IS_TMC(Z2)
+      stepperZ2.rms_current(previous_current_arr[1]);
+    #endif
+    #if AXIS_IS_TMC(Z3)
+      stepperZ3.rms_current(previous_current_arr[2]);
+    #endif
+    #if AXIS_IS_TMC(Z4)
+      stepperZ4.rms_current(previous_current_arr[3]);
+    #endif
+  #endif
+
+  #ifdef GANTRY_CALIBRATION_COMMANDS_POST
+    if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("Running Post Commands");
+    gcode.process_subcommands_now_P(PSTR(GANTRY_CALIBRATION_COMMANDS_POST));
+  #endif
+
+  SET_SOFT_ENDSTOP_LOOSE(false);
+}
+
+#endif // MECHANICAL_GANTRY_CALIBRATION