Starting with Stock BTT-Config and Old Configs as Backup

Marlin/src/gcode/feature/filwidth/M404-M407.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(FILAMENT_WIDTH_SENSOR)
+
+#include "../../../feature/filwidth.h"
+#include "../../../module/planner.h"
+#include "../../../MarlinCore.h"
+#include "../../gcode.h"
+
+/**
+ * M404: Display or set (in current units) the nominal filament width (3mm, 1.75mm ) W<3.0>
+ */
+void GcodeSuite::M404() {
+  if (parser.seenval('W')) {
+    filwidth.nominal_mm = parser.value_linear_units();
+    planner.volumetric_area_nominal = CIRCLE_AREA(filwidth.nominal_mm * 0.5);
+  }
+  else
+    SERIAL_ECHOLNPAIR("Filament dia (nominal mm):", filwidth.nominal_mm);
+}
+
+/**
+ * M405: Turn on filament sensor for control
+ */
+void GcodeSuite::M405() {
+  // This is technically a linear measurement, but since it's quantized to centimeters and is a different
+  // unit than everything else, it uses parser.value_byte() instead of parser.value_linear_units().
+  if (parser.seenval('D'))
+    filwidth.set_delay_cm(parser.value_byte());
+
+  filwidth.enable(true);
+}
+
+/**
+ * M406: Turn off filament sensor for control
+ */
+void GcodeSuite::M406() {
+  filwidth.enable(false);
+  planner.calculate_volumetric_multipliers();   // Restore correct 'volumetric_multiplier' value
+}
+
+/**
+ * M407: Get measured filament diameter on serial output
+ */
+void GcodeSuite::M407() {
+  SERIAL_ECHOLNPAIR("Filament dia (measured mm):", filwidth.measured_mm);
+}
+
+#endif // FILAMENT_WIDTH_SENSOR