diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 4b0eb703b..1d9b92bef 100755
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -616,12 +616,12 @@ static uint8_t target_extruder;
 float cartes[XYZ] = { 0 };
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  bool filament_sensor = false;  //M405 turns on filament_sensor control, M406 turns it off
-  float filament_width_nominal = DEFAULT_NOMINAL_FILAMENT_DIA,  // Nominal filament width. Change with M404
+  bool filament_sensor = false;                                 // M405 turns on filament sensor control. M406 turns it off.
+  float filament_width_nominal = DEFAULT_NOMINAL_FILAMENT_DIA,  // Nominal filament width. Change with M404.
         filament_width_meas = DEFAULT_MEASURED_FILAMENT_DIA;    // Measured filament diameter
-  int8_t measurement_delay[MAX_MEASUREMENT_DELAY + 1]; // Ring buffer to delayed measurement. Store extruder factor after subtracting 100
-  int filwidth_delay_index[2] = { 0, -1 };  // Indexes into ring buffer
-  int meas_delay_cm = MEASUREMENT_DELAY_CM;  //distance delay setting
+  int8_t measurement_delay[MAX_MEASUREMENT_DELAY + 1];          // Ring buffer to delayed measurement. Store extruder factor after subtracting 100
+  int filwidth_delay_index[2] = { 0, -1 };                      // Indexes into ring buffer
+  int meas_delay_cm = MEASUREMENT_DELAY_CM;                     // Distance delay setting
 #endif
 
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
@@ -8220,10 +8220,10 @@ inline void gcode_M400() { stepper.synchronize(); }
     NOMORE(meas_delay_cm, MAX_MEASUREMENT_DELAY);
 
     if (filwidth_delay_index[1] == -1) { // Initialize the ring buffer if not done since startup
-      int temp_ratio = thermalManager.widthFil_to_size_ratio();
+      const int temp_ratio = thermalManager.widthFil_to_size_ratio() - 100; // -100 to scale within a signed byte
 
       for (uint8_t i = 0; i < COUNT(measurement_delay); ++i)
-        measurement_delay[i] = temp_ratio - 100;  // Subtract 100 to scale within a signed byte
+        measurement_delay[i] = temp_ratio;
 
       filwidth_delay_index[0] = filwidth_delay_index[1] = 0;
     }
@@ -10279,7 +10279,7 @@ void process_next_command() {
         case 407:   // M407: Display measured filament diameter
           gcode_M407();
           break;
-      #endif // ENABLED(FILAMENT_WIDTH_SENSOR)
+      #endif // FILAMENT_WIDTH_SENSOR
 
       #if PLANNER_LEVELING
         case 420: // M420: Enable/Disable Bed Leveling
diff --git a/Marlin/printcounter.cpp b/Marlin/printcounter.cpp
index 469a7332d..09f31f783 100644
--- a/Marlin/printcounter.cpp
+++ b/Marlin/printcounter.cpp
@@ -188,7 +188,8 @@ bool PrintCounter::start() {
     }
     return true;
   }
-  else return false;
+
+  return false;
 }
 
 // @Override
diff --git a/Marlin/printcounter.h b/Marlin/printcounter.h
index ffa580800..0eeded9d5 100644
--- a/Marlin/printcounter.h
+++ b/Marlin/printcounter.h
@@ -32,12 +32,12 @@
 // Print debug messages with M111 S2
 //#define DEBUG_PRINTCOUNTER
 
-struct printStatistics {    // 13 bytes
+struct printStatistics {    // 16 bytes (20 with real doubles)
   //const uint8_t magic;    // Magic header, it will always be 0x16
   uint16_t totalPrints;     // Number of prints
   uint16_t finishedPrints;  // Number of complete prints
   uint32_t printTime;       // Accumulated printing time
-  uint32_t longestPrint;    // Longest successfull print job
+  uint32_t longestPrint;    // Longest successful print job
   double   filamentUsed;    // Accumulated filament consumed in mm
 };
 
diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index eb61f6602..245739da1 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -774,7 +774,7 @@ void Temperature::manage_heater() {
       NOLESS(vm, 0.01);
       volumetric_multiplier[FILAMENT_SENSOR_EXTRUDER_NUM] = vm;
     }
-  #endif //FILAMENT_WIDTH_SENSOR
+  #endif // FILAMENT_WIDTH_SENSOR
 
   #if DISABLED(PIDTEMPBED)
     if (PENDING(ms, next_bed_check_ms)) return;
@@ -961,8 +961,8 @@ void Temperature::updateTemperaturesFromRawValues() {
  */
 void Temperature::init() {
 
-  #if MB(RUMBA) && ((TEMP_SENSOR_0==-1)||(TEMP_SENSOR_1==-1)||(TEMP_SENSOR_2==-1)||(TEMP_SENSOR_BED==-1))
-    //disable RUMBA JTAG in case the thermocouple extension is plugged on top of JTAG connector
+  #if MB(RUMBA) && (TEMP_SENSOR_0 == -1 || TEMP_SENSOR_1 == -1 || TEMP_SENSOR_2 == -1 || TEMP_SENSOR_BED == -1)
+    // Disable RUMBA JTAG in case the thermocouple extension is plugged on top of JTAG connector
     MCUCR = _BV(JTD);
     MCUCR = _BV(JTD);
   #endif
diff --git a/Marlin/ultralcd.cpp b/Marlin/ultralcd.cpp
index 3031d56f8..122b8b3bd 100755
--- a/Marlin/ultralcd.cpp
+++ b/Marlin/ultralcd.cpp
@@ -2725,7 +2725,7 @@ void kill_screen(const char* lcd_msg) {
 
         START_SCREEN();                                                                                // 12345678901234567890
         STATIC_ITEM(MSG_INFO_PRINT_COUNT ": ", false, false, itostr3left(stats.totalPrints));          // Print Count: 999
-        STATIC_ITEM(MSG_INFO_COMPLETED_PRINTS": ", false, false, itostr3left(stats.finishedPrints)); // Completed  : 666
+        STATIC_ITEM(MSG_INFO_COMPLETED_PRINTS": ", false, false, itostr3left(stats.finishedPrints));   // Completed  : 666
 
         duration_t elapsed = stats.printTime;
         elapsed.toString(buffer);