diff --git a/Marlin/SdBaseFile.cpp b/Marlin/SdBaseFile.cpp
index ac8e445c8..3460b24d3 100644
--- a/Marlin/SdBaseFile.cpp
+++ b/Marlin/SdBaseFile.cpp
@@ -339,38 +339,38 @@ int8_t SdBaseFile::lsPrintNext(uint8_t flags, uint8_t indent) {
         && DIR_IS_FILE_OR_SUBDIR(&dir)) break;
   }
   // indent for dir level
-  for (uint8_t i = 0; i < indent; i++) MYSERIAL0.write(' ');
+  for (uint8_t i = 0; i < indent; i++) SERIAL_CHAR(' ');
 
   // print name
   for (uint8_t i = 0; i < 11; i++) {
     if (dir.name[i] == ' ')continue;
     if (i == 8) {
-      MYSERIAL0.write('.');
+      SERIAL_CHAR('.');
       w++;
     }
-    MYSERIAL0.write(dir.name[i]);
+    SERIAL_CHAR(dir.name[i]);
     w++;
   }
   if (DIR_IS_SUBDIR(&dir)) {
-    MYSERIAL0.write('/');
+    SERIAL_CHAR('/');
     w++;
   }
   if (flags & (LS_DATE | LS_SIZE)) {
-    while (w++ < 14) MYSERIAL0.write(' ');
+    while (w++ < 14) SERIAL_CHAR(' ');
   }
   // print modify date/time if requested
   if (flags & LS_DATE) {
-    MYSERIAL0.write(' ');
+    SERIAL_CHAR(' ');
     printFatDate(dir.lastWriteDate);
-    MYSERIAL0.write(' ');
+    SERIAL_CHAR(' ');
     printFatTime(dir.lastWriteTime);
   }
   // print size if requested
   if (!DIR_IS_SUBDIR(&dir) && (flags & LS_SIZE)) {
-    MYSERIAL0.write(' ');
-    MYSERIAL0.print(dir.fileSize);
+    SERIAL_CHAR(' ');
+    SERIAL_PROTOCOL(dir.fileSize);
   }
-  MYSERIAL0.println();
+  SERIAL_EOL();
   return DIR_IS_FILE(&dir) ? 1 : 2;
 }
 
@@ -905,8 +905,8 @@ int SdBaseFile::peek() {
 
 // print uint8_t with width 2
 static void print2u(uint8_t v) {
-  if (v < 10) MYSERIAL0.write('0');
-  MYSERIAL0.print(v, DEC);
+  if (v < 10) SERIAL_CHAR('0');
+  SERIAL_PRINT(v, DEC);
 }
 
 /**
@@ -927,10 +927,10 @@ static void print2u(uint8_t v) {
  * \param[in] fatDate The date field from a directory entry.
  */
 void SdBaseFile::printFatDate(uint16_t fatDate) {
-  MYSERIAL0.print(FAT_YEAR(fatDate));
-  MYSERIAL0.write('-');
+  SERIAL_PROTOCOL(FAT_YEAR(fatDate));
+  SERIAL_CHAR('-');
   print2u(FAT_MONTH(fatDate));
-  MYSERIAL0.write('-');
+  SERIAL_CHAR('-');
   print2u(FAT_DAY(fatDate));
 }
 
@@ -945,9 +945,9 @@ void SdBaseFile::printFatDate(uint16_t fatDate) {
  */
 void SdBaseFile::printFatTime(uint16_t fatTime) {
   print2u(FAT_HOUR(fatTime));
-  MYSERIAL0.write(':');
+  SERIAL_CHAR(':');
   print2u(FAT_MINUTE(fatTime));
-  MYSERIAL0.write(':');
+  SERIAL_CHAR(':');
   print2u(FAT_SECOND(fatTime));
 }
 
@@ -959,7 +959,7 @@ void SdBaseFile::printFatTime(uint16_t fatTime) {
 bool SdBaseFile::printName() {
   char name[FILENAME_LENGTH];
   if (!getFilename(name)) return false;
-  MYSERIAL0.print(name);
+  SERIAL_PROTOCOL(name);
   return true;
 }
 
diff --git a/Marlin/SdFatUtil.cpp b/Marlin/SdFatUtil.cpp
index 2e9ce939b..2bd471bc6 100644
--- a/Marlin/SdFatUtil.cpp
+++ b/Marlin/SdFatUtil.cpp
@@ -63,7 +63,7 @@ int SdFatUtil::FreeRam() {
  * \param[in] str Pointer to string stored in flash memory.
  */
 void SdFatUtil::print_P(PGM_P str) {
-  for (uint8_t c; (c = pgm_read_byte(str)); str++) MYSERIAL0.write(c);
+  for (uint8_t c; (c = pgm_read_byte(str)); str++) SERIAL_CHAR(c);
 }
 
 /**
@@ -72,7 +72,7 @@ void SdFatUtil::print_P(PGM_P str) {
  * \param[in] pr Print object for output.
  * \param[in] str Pointer to string stored in flash memory.
  */
-void SdFatUtil::println_P(PGM_P str) { print_P(str); MYSERIAL0.println(); }
+void SdFatUtil::println_P(PGM_P str) { print_P(str); SERIAL_EOL(); }
 
 /**
  * %Print a string in flash memory to Serial.
diff --git a/Marlin/pinsDebug.h b/Marlin/pinsDebug.h
index 8a89818f5..9056f3a3a 100644
--- a/Marlin/pinsDebug.h
+++ b/Marlin/pinsDebug.h
@@ -474,9 +474,9 @@ inline void report_pin_state_extended(int8_t pin, bool ignore, bool extended = f
       for (uint8_t y = 0; y < 28; y++) {                   // always print pin name
         temp_char = pgm_read_byte(name_mem_pointer + y);
         if (temp_char != 0)
-          MYSERIAL0.write(temp_char);
+          SERIAL_CHAR(temp_char);
         else {
-          for (uint8_t i = 0; i < 28 - y; i++) MYSERIAL0.write(' ');
+          for (uint8_t i = 0; i < 28 - y; i++) SERIAL_CHAR(' ');
           break;
         }
       }
diff --git a/Marlin/serial.cpp b/Marlin/serial.cpp
index 2859b058a..8b6a1c2b4 100644
--- a/Marlin/serial.cpp
+++ b/Marlin/serial.cpp
@@ -33,4 +33,4 @@ void serial_echopair_PGM(const char* s_P, float v)         { serialprintPGM(s_P)
 void serial_echopair_PGM(const char* s_P, double v)        { serialprintPGM(s_P); SERIAL_ECHO(v); }
 void serial_echopair_PGM(const char* s_P, unsigned long v) { serialprintPGM(s_P); SERIAL_ECHO(v); }
 
-void serial_spaces(uint8_t count) { count *= (PROPORTIONAL_FONT_RATIO); while (count--) MYSERIAL0.write(' '); }
+void serial_spaces(uint8_t count) { count *= (PROPORTIONAL_FONT_RATIO); while (count--) SERIAL_CHAR(' '); }
diff --git a/Marlin/stepper.h b/Marlin/stepper.h
index 3dd0283c3..af541e89d 100644
--- a/Marlin/stepper.h
+++ b/Marlin/stepper.h
@@ -336,8 +336,8 @@ class Stepper {
       }
       if (timer < 100) { // (20kHz - this should never happen)
         timer = 100;
-        MYSERIAL0.print(MSG_STEPPER_TOO_HIGH);
-        MYSERIAL0.println(step_rate);
+        SERIAL_PROTOCOL(MSG_STEPPER_TOO_HIGH);
+        SERIAL_PROTOCOLLN(step_rate);
       }
       return timer;
     }