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diff --git a/Marlin/src/feature/filwidth.cpp b/Marlin/src/feature/filwidth.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 "filwidth.h"
+
+FilamentWidthSensor filwidth;
+
+bool FilamentWidthSensor::enabled; // = false;                          // (M405-M406) Filament Width Sensor ON/OFF.
+uint32_t FilamentWidthSensor::accum; // = 0                             // ADC accumulator
+uint16_t FilamentWidthSensor::raw; // = 0                               // Measured filament diameter - one extruder only
+float FilamentWidthSensor::nominal_mm = DEFAULT_NOMINAL_FILAMENT_DIA,   // (M104) Nominal filament width
+      FilamentWidthSensor::measured_mm = DEFAULT_MEASURED_FILAMENT_DIA, // Measured filament diameter
+      FilamentWidthSensor::e_count = 0,
+      FilamentWidthSensor::delay_dist = 0;
+uint8_t FilamentWidthSensor::meas_delay_cm = MEASUREMENT_DELAY_CM;      // Distance delay setting
+int8_t FilamentWidthSensor::ratios[MAX_MEASUREMENT_DELAY + 1],          // Ring buffer to delay measurement. (Extruder factor minus 100)
+       FilamentWidthSensor::index_r,                                    // Indexes into ring buffer
+       FilamentWidthSensor::index_w;
+
+void FilamentWidthSensor::init() {
+  const int8_t ratio = sample_to_size_ratio();
+  LOOP_L_N(i, COUNT(ratios)) ratios[i] = ratio;
+  index_r = index_w = 0;
+}
+
+#endif // FILAMENT_WIDTH_SENSOR