Remove the checkbox in Printer Settings. The feature will be turned off by setting zero, so it is consistent with bed temperature.

src/libslic3r/GCode.cpp

@@ -1899,7 +1899,7 @@ void GCodeGenerator::_print_first_layer_bed_temperature(GCodeOutputStream &file,
 // M191 - Set chamber Temperature and Wait
 void GCodeGenerator::_print_first_layer_chamber_temperature(GCodeOutputStream &file, const Print &print, const std::string &gcode, int temp, bool wait, bool accurate)
 {
-    if (! print.config().heated_chamber)
+    if (temp == 0)
         return;
     bool autoemit = print.config().autoemit_temperature_commands;
     // Is the bed temperature set by the provided custom G-code?

src/libslic3r/Preset.cpp

@@ -512,7 +512,7 @@ static std::vector<std::string> s_Preset_printer_options {
     "between_objects_gcode", "printer_vendor", "printer_model", "printer_variant", "printer_notes", "cooling_tube_retraction",
     "cooling_tube_length", "high_current_on_filament_swap", "parking_pos_retraction", "extra_loading_move", "multimaterial_purging",
     "max_print_height", "default_print_profile", "inherits",
-    "remaining_times", "silent_mode", "heated_chamber",
+    "remaining_times", "silent_mode",
     "machine_limits_usage", "thumbnails", "thumbnails_format"
 };
 

src/libslic3r/PrintConfig.cpp

@@ -499,7 +499,8 @@ void PrintConfigDef::init_fff_params()
     def = this->add("chamber_temperature", coInts);
     def->label = L("Nominal");
     def->full_label = L("Chamber temperature");
-    def->tooltip = L("Required chamber temperature for the print. Only used when heated chamber is supported by the printer.");
+    def->tooltip = L("Required chamber temperature for the print.\nWhen set to zero, "
+                     "the nominal chamber temperature is not set in the G-code.");
     def->sidetext = L("°C");
     def->min = 0;
     def->max = 1000;
@@ -509,8 +510,9 @@ void PrintConfigDef::init_fff_params()
     def = this->add("chamber_minimal_temperature", coInts);
     def->label = L("Minimal");
     def->full_label = L("Chamber minimal temperature");
-    def->tooltip = L("Minimal chamber temperature that the printer should wait for before the print starts. This allows "
-                     "to start the print before the nominal chamber temperature is reached.");
+    def->tooltip = L("Minimal chamber temperature that the printer waits for before the print starts. This allows "
+                     "to start the print before the nominal chamber temperature is reached.\nWhen set to zero, "
+                     "the minimal chamber temperature is not set in the G-code.");
     def->sidetext = L("°C");
     def->min = 0;
     def->max = 1000;
@@ -1857,15 +1859,6 @@ void PrintConfigDef::init_fff_params()
     def->mode = comExpert;
     def->set_default_value(new ConfigOptionString(""));
 
-    def = this->add("heated_chamber", coBool);
-    def->label = L("Supports heated chamber");
-    def->tooltip = L("When enabled, G-codes to heat up the chamber will be emitted before and after the Start G-code (unless they are "
-                     "explicitely used in the Start G-code).\n\nThe temperature can be configured in Filament Settings, "
-                     "temperature for the first printing filament will be used. The chamber heating is not turned off "
-                     "at the end, the user is supposed to do it in custom End G-code when they want it.");
-    def->mode = comExpert;
-    def->set_default_value(new ConfigOptionBool(false));
-
     def = this->add("remaining_times", coBool);
     def->label = L("Supports remaining times");
     def->tooltip = L("Emit M73 P[percent printed] R[remaining time in minutes] at 1 minute"

src/libslic3r/PrintConfig.hpp

@@ -790,7 +790,6 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionFloat,               parking_pos_retraction))
     ((ConfigOptionBool,                remaining_times))
     ((ConfigOptionBool,                silent_mode))
-    ((ConfigOptionBool,                heated_chamber))
     ((ConfigOptionFloat,               extra_loading_move))
     ((ConfigOptionFloat,               multimaterial_purging))
     ((ConfigOptionString,              color_change_gcode))

src/slic3r/GUI/Tab.cpp

@@ -2385,13 +2385,6 @@ void TabFilament::toggle_options()
         }
     }
 
-    if (m_active_page->title() == "Filament")
-    {
-        bool supports_chamber = m_preset_bundle->printers.get_edited_preset().config.opt_bool("heated_chamber");
-        toggle_option("chamber_temperature", supports_chamber);
-        toggle_option("chamber_minimal_temperature", supports_chamber);
-    }
-
     if (m_active_page->title() == "Advanced")
     {
         bool multitool_ramming = m_config->opt_bool("filament_multitool_ramming", 0);
@@ -2703,7 +2696,6 @@ void TabPrinter::build_fff()
         optgroup->append_single_option_line("silent_mode");
         optgroup->append_single_option_line("remaining_times");
         optgroup->append_single_option_line("binary_gcode");
-        optgroup->append_single_option_line("heated_chamber");
 
         optgroup->on_change = [this](t_config_option_key opt_key, boost::any value) {
             wxTheApp->CallAfter([this, opt_key, value]() {