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diff --git a/Marlin/src/gcode/feature/advance/M900.cpp b/Marlin/src/gcode/feature/advance/M900.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/MarlinConfig.h"
+
+#if ENABLED(LIN_ADVANCE)
+
+#include "../../gcode.h"
+#include "../../../module/planner.h"
+#include "../../../module/stepper.h"
+
+#if ENABLED(EXTRA_LIN_ADVANCE_K)
+  float other_extruder_advance_K[EXTRUDERS];
+  uint8_t lin_adv_slot = 0;
+#endif
+
+/**
+ * M900: Get or Set Linear Advance K-factor
+ *  T<tool>     Which tool to address
+ *  K<factor>   Set current advance K factor (Slot 0).
+ *  L<factor>   Set secondary advance K factor (Slot 1). Requires EXTRA_LIN_ADVANCE_K.
+ *  S<0/1>      Activate slot 0 or 1. Requires EXTRA_LIN_ADVANCE_K.
+ */
+void GcodeSuite::M900() {
+
+  auto echo_value_oor = [](const char ltr, const bool ten=true) {
+    SERIAL_CHAR('?'); SERIAL_CHAR(ltr);
+    SERIAL_ECHOPGM(" value out of range");
+    if (ten) SERIAL_ECHOPGM(" (0-10)");
+    SERIAL_ECHOLNPGM(".");
+  };
+
+  #if EXTRUDERS < 2
+    constexpr uint8_t tool_index = 0;
+  #else
+    const uint8_t tool_index = parser.intval('T', active_extruder);
+    if (tool_index >= EXTRUDERS) {
+      echo_value_oor('T', false);
+      return;
+    }
+  #endif
+
+  float &kref = planner.extruder_advance_K[tool_index], newK = kref;
+  const float oldK = newK;
+
+  #if ENABLED(EXTRA_LIN_ADVANCE_K)
+
+    float &lref = other_extruder_advance_K[tool_index];
+
+    const bool old_slot = TEST(lin_adv_slot, tool_index), // The tool's current slot (0 or 1)
+               new_slot = parser.boolval('S', old_slot);  // The passed slot (default = current)
+
+    // If a new slot is being selected swap the current and
+    // saved K values. Do here so K/L will apply correctly.
+    if (new_slot != old_slot) {                       // Not the same slot?
+      SET_BIT_TO(lin_adv_slot, tool_index, new_slot); // Update the slot for the tool
+      newK = lref;                                    // Get new K value from backup
+      lref = oldK;                                    // Save K to backup
+    }
+
+    // Set the main K value. Apply if the main slot is active.
+    if (parser.seenval('K')) {
+      const float K = parser.value_float();
+      if (!WITHIN(K, 0, 10)) echo_value_oor('K');
+      else if (new_slot)        lref = K;             // S1 Knn
+      else                      newK = K;             // S0 Knn
+    }
+
+    // Set the extra K value. Apply if the extra slot is active.
+    if (parser.seenval('L')) {
+      const float L = parser.value_float();
+      if (!WITHIN(L, 0, 10)) echo_value_oor('L');
+      else if (!new_slot)       lref = L;             // S0 Lnn
+      else                      newK = L;             // S1 Lnn
+    }
+
+  #else
+
+    if (parser.seenval('K')) {
+      const float K = parser.value_float();
+      if (WITHIN(K, 0, 10))
+        newK = K;
+      else
+        echo_value_oor('K');
+    }
+
+  #endif
+
+  if (newK != oldK) {
+    planner.synchronize();
+    kref = newK;
+  }
+
+  if (!parser.seen_any()) {
+
+    #if ENABLED(EXTRA_LIN_ADVANCE_K)
+
+      #if EXTRUDERS < 2
+        SERIAL_ECHOLNPAIR("Advance S", int(new_slot), " K", kref, "(S", int(!new_slot), " K", lref, ")");
+      #else
+        LOOP_L_N(i, EXTRUDERS) {
+          const bool slot = TEST(lin_adv_slot, i);
+          SERIAL_ECHOLNPAIR("Advance T", int(i), " S", int(slot), " K", planner.extruder_advance_K[i],
+                            "(S", int(!slot), " K", other_extruder_advance_K[i], ")");
+          SERIAL_EOL();
+        }
+      #endif
+
+    #else
+
+      SERIAL_ECHO_START();
+      #if EXTRUDERS < 2
+        SERIAL_ECHOLNPAIR("Advance K=", planner.extruder_advance_K[0]);
+      #else
+        SERIAL_ECHOPGM("Advance K");
+        LOOP_L_N(i, EXTRUDERS) {
+          SERIAL_CHAR(' ', '0' + i, ':');
+          SERIAL_DECIMAL(planner.extruder_advance_K[i]);
+        }
+        SERIAL_EOL();
+      #endif
+
+    #endif
+  }
+
+}
+
+#endif // LIN_ADVANCE