✨ M550 CONFIGURABLE_MACHINE_NAME

Author: thinkyhead

Marlin/Configuration.h

@@ -129,6 +129,7 @@
 
 // Name displayed in the LCD "Ready" message and Info menu
 //#define CUSTOM_MACHINE_NAME "3D Printer"
+//#define CONFIGURABLE_MACHINE_NAME // Add G-code M550 to set/report the machine name
 
 // Printer's unique ID, used by some programs to differentiate between machines.
 // Choose your own or use a service like https://www.uuidgenerator.net/version4

Marlin/Configuration_adv.h

@@ -2227,7 +2227,7 @@
 
   // Developer menu (accessed by touching "About Printer" copyright text)
   //#define TOUCH_UI_DEVELOPER_MENU
-#endif
+#endif // TOUCH_UI_FTDI_EVE
 
 //
 // Classic UI Options

Marlin/src/MarlinCore.cpp

@@ -271,6 +271,10 @@
 
 PGMSTR(M112_KILL_STR, "M112 Shutdown");
 
+#if ENABLED(CONFIGURABLE_MACHINE_NAME)
+  MString<64> machine_name;
+#endif
+
 MarlinState marlin_state = MarlinState::MF_INITIALIZING;
 
 // For M109 and M190, this flag may be cleared (by M108) to exit the wait loop
@@ -1363,6 +1367,10 @@ void setup() {
   SETUP_RUN(settings.first_load());   // Load data from EEPROM if available (or use defaults)
                                       // This also updates variables in the planner, elsewhere
 
+  #if ENABLED(CONFIGURABLE_MACHINE_NAME)
+    SETUP_RUN(ui.reset_status(false)); // machine_name Initialized by settings.load()
+  #endif
+
   #if ENABLED(PROBE_TARE)
     SETUP_RUN(probe.tare_init());
   #endif

Marlin/src/MarlinCore.h

@@ -41,6 +41,10 @@ inline void idle_no_sleep() { idle(true); }
 void kill(FSTR_P const lcd_error=nullptr, FSTR_P const lcd_component=nullptr, const bool steppers_off=false);
 void minkill(const bool steppers_off=false);
 
+#if ENABLED(CONFIGURABLE_MACHINE_NAME)
+  extern MString<64> machine_name;
+#endif
+
 // Global State of the firmware
 enum class MarlinState : uint8_t {
   MF_INITIALIZING = 0,

Marlin/src/core/language.h

@@ -88,6 +88,7 @@
   #undef  MACHINE_NAME
   #define MACHINE_NAME DEFAULT_MACHINE_NAME
 #endif
+#define MACHINE_NAME_SUBST TERN(CONFIGURABLE_MACHINE_NAME, "$", MACHINE_NAME)
 
 #define MARLIN_WEBSITE_URL "marlinfw.org"
 

Marlin/src/core/mstring.h

@@ -298,6 +298,9 @@ class MString {
   MString& clear() { return set(); }
   MString& eol() { return append('\n'); }
   MString& trunc(const int &i) { if (i <= SIZE) str[i] = '\0'; debug(F("trunc")); return *this; }
+  MString& ltrim() { char *s = str; while (*s == ' ') ++s; if (s != str) strcpy(str, s); return *this; }
+  MString& rtrim() { int s = length(); while (s && str[s - 1] == ' ') --s; str[s] = '\0'; return *this; }
+  MString& trim() { return rtrim().ltrim(); }
 
   // Truncate on a Unicode boundary
   MString& utrunc(const int &n=SIZE) {

Marlin/src/gcode/config/M550.cpp

@@ -0,0 +1,59 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2025 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(CONFIGURABLE_MACHINE_NAME)
+
+#include "../gcode.h"
+#include "../../MarlinCore.h"
+#include "../../lcd/marlinui.h"
+
+/**
+ * M550: Set machine name
+ *
+ * Parameters:
+ *  P "<name>" Set the name using the 'P' parameter (RepRapFirmware)
+ *  "<name>" Set the name using the "string" parameter
+ */
+void GcodeSuite::M550() {
+  bool did_set = true;
+
+  if (parser.seenval('P'))
+    machine_name = parser.value_string();
+  else if (TERN(GCODE_QUOTED_STRINGS, false, parser.seen('P')))
+    machine_name = parser.string_arg[0] == 'P' ? &parser.string_arg[1] : parser.string_arg;
+  else if (parser.string_arg && parser.string_arg[0])
+    machine_name = parser.string_arg;
+  else
+    did_set = false;
+
+  if (did_set) {
+    machine_name.trim();
+    ui.reset_status(false);
+  }
+  else
+    SERIAL_ECHOLNPGM("RepRap name: ", &machine_name);
+
+}
+
+#endif // CONFIGURABLE_MACHINE_NAME

Marlin/src/gcode/control/M80_M81.cpp

@@ -38,7 +38,7 @@
   #include "../../feature/powerloss.h"
 #endif
 
-#if HAS_SUICIDE
+#if ANY(HAS_SUICIDE, CONFIGURABLE_MACHINE_NAME)
   #include "../../MarlinCore.h"
 #endif
 
@@ -92,7 +92,11 @@ void GcodeSuite::M81() {
 
   safe_delay(1000); // Wait 1 second before switching off
 
-  LCD_MESSAGE_F(MACHINE_NAME " " STR_OFF ".");
+  #if ENABLED(CONFIGURABLE_MACHINE_NAME)
+    ui.set_status(&MString<30>(&machine_name, ' ', F(STR_OFF), '.'));
+  #else
+    LCD_MESSAGE_F(MACHINE_NAME " " STR_OFF ".");
+  #endif
 
   bool delayed_power_off = false;
 

Marlin/src/gcode/gcode.cpp

@@ -947,6 +947,10 @@ void GcodeSuite::process_parsed_command(const bool no_ok/*=false*/) {
         case 540: M540(); break;                                  // M540: Set abort on endstop hit for SD printing
       #endif
 
+      #if ENABLED(CONFIGURABLE_MACHINE_NAME)
+        case 550: M550(); break;                                  // M550: Set machine name
+      #endif
+
       #if HAS_ETHERNET
         case 552: M552(); break;                                  // M552: Set IP address
         case 553: M553(); break;                                  // M553: Set gateway

Marlin/src/gcode/gcode.h

@@ -261,6 +261,7 @@
  * M512 - Set/Change/Remove Password (Requires PASSWORD_CHANGE_GCODE)
  * M524 - Abort the current SD print job started with M24. (Requires SDSUPPORT)
  * M540 - Enable/disable SD card abort on endstop hit: "M540 S<state>". (Requires SD_ABORT_ON_ENDSTOP_HIT)
+ * M550 - Set the machine name: "M550 P<name>". (Requires CONFIGURABLE_MACHINE_NAME)
  * M552 - Get or set IP address. Enable/disable network interface. (Requires enabled Ethernet port)
  * M553 - Get or set IP netmask. (Requires enabled Ethernet port)
  * M554 - Get or set IP gateway. (Requires enabled Ethernet port)
@@ -1128,6 +1129,10 @@ class GcodeSuite {
     static void M540();
   #endif
 
+  #if ENABLED(CONFIGURABLE_MACHINE_NAME)
+    static void M550();
+  #endif
+
   #if HAS_ETHERNET
     static void M552();
     static void M552_report();