diff --git a/CLAUDE.md b/CLAUDE.md
index eb35833082..61d292aee3 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -70,6 +70,25 @@ build_release_vs2022.bat slicer
 ./build_linux.sh -c    # clean build
 ./build_linux.sh -r    # skip RAM/disk checks
 ./build_linux.sh -l    # use Clang instead of GCC
+```
+### Build test:
+
+**Always use this command to build the project when testing build issues on Windows.**
+```bash
+cmake --build . --config %build_type% --target ALL_BUILD -- -m
+```
+
+### Building on macOS
+**Always use this command to build the project when testing build issues on macOS.**
+```bash
+cmake --build build/arm64 --config RelWithDebInfo --target all --
+```
+
+### Building on Linux
+ **Always use this command to build the project when testing build issues on Linux.**
+```bash
+cmake --build build/arm64 --config RelWithDebInfo --target all --
+
 ```
 
 ### Build System
diff --git a/resources/web/guide/22/22.js b/resources/web/guide/22/22.js
index abc887653d..0283936ee0 100644
--- a/resources/web/guide/22/22.js
+++ b/resources/web/guide/22/22.js
@@ -514,14 +514,14 @@ function ResponseFilamentResult()
 	let FilaArray=new Array();
 	for(let n=0;n<nAll;n++)
 	{
-		let sName=FilaSelectedList[n].getAttribute("name");
-		
-	    for( let key in m_ProfileItem['filament'] )
-	    {
-			let FName=GetFilamentShortname(key);
-			
-			if(FName==sName)
-				FilaArray.push(key);
+		let strFilalist=FilaSelectedList[n].getAttribute("filalist");
+		if(strFilalist) {
+			let filaNames = strFilalist.split(';');
+			for(let i=0; i<filaNames.length; i++) {
+				let fname = filaNames[i].trim();
+				if(fname !== '')
+					FilaArray.push(fname);
+			}
 		}
 	}
 	
diff --git a/resources/web/guide/23/23.js b/resources/web/guide/23/23.js
index f97ff4f38c..a0071f503e 100644
--- a/resources/web/guide/23/23.js
+++ b/resources/web/guide/23/23.js
@@ -491,14 +491,14 @@ function ResponseFilamentResult()
 	let FilaArray=new Array();
 	for(let n=0;n<nAll;n++)
 	{
-		let sName=FilaSelectedList[n].getAttribute("name");
-		
-	    for( let key in m_ProfileItem['filament'] )
-	    {
-			let FName=GetFilamentShortname(key);
-			
-			if(FName==sName)
-				FilaArray.push(key);
+		let strFilalist=FilaSelectedList[n].getAttribute("filalist");
+		if(strFilalist) {
+			let filaNames = strFilalist.split(';');
+			for(let i=0; i<filaNames.length; i++) {
+				let fname = filaNames[i].trim();
+				if(fname !== '')
+					FilaArray.push(fname);
+			}
 		}
 	}
 	
diff --git a/src/libslic3r/PresetBundle.cpp b/src/libslic3r/PresetBundle.cpp
index 0c25f8ae72..0ee55726d7 100644
--- a/src/libslic3r/PresetBundle.cpp
+++ b/src/libslic3r/PresetBundle.cpp
@@ -2115,6 +2115,15 @@ void PresetBundle::export_selections(AppConfig &config)
     auto printer_name = printers.get_selected_preset_name();
     config.set("presets", PRESET_PRINTER_NAME, printer_name);
 
+    // Don't persist settings for the built-in "Default Printer" placeholder —
+    // it's only the initial state before a real printer is loaded/selected.
+    // Also clean up any stale entry that other code paths (e.g. bed type change)
+    // may have created for "Default Printer".
+    if (printer_name == "Default Printer") {
+        config.clear_printer_settings("Default Printer");
+        return;
+    }
+
     config.clear_printer_settings(printer_name);
     config.set_printer_setting(printer_name, PRESET_PRINTER_NAME, printer_name);
     config.set_printer_setting(printer_name, PRESET_PRINT_NAME, prints.get_selected_preset_name());
diff --git a/src/slic3r/GUI/WebGuideDialog.cpp b/src/slic3r/GUI/WebGuideDialog.cpp
index ee07b06ce0..ef1c6c34c8 100644
--- a/src/slic3r/GUI/WebGuideDialog.cpp
+++ b/src/slic3r/GUI/WebGuideDialog.cpp
@@ -838,14 +838,67 @@ bool GuideFrame::apply_config(AppConfig *app_config, PresetBundle *preset_bundle
     // Not switch filament
     //get_first_added_material_preset(AppConfig::SECTION_FILAMENTS, first_added_filament);
 
+    // For each @System filament, check if a vendor-specific override exists
+    // in the loaded profiles. If so, replace the @System variant with the
+    // override (e.g. replace "Generic ABS @System" with BBL "Generic ABS").
+    // When printers from the default bundle are also selected, keep @System
+    // too since those printers need it.
+    static const std::string system_suffix              = " @System";
+    auto                     it_default                 = enabled_vendors.find(PresetBundle::ORCA_DEFAULT_BUNDLE);
+    bool                     has_default_bundle_printer = it_default != enabled_vendors.end() && !it_default->second.empty();
+    bool                     has_filament_profiles      = m_ProfileJson.contains("filament");
+
+    // Check if any non-default vendor has selected printers
+    bool has_vendor_printer = false;
+    for (const auto& [vendor, models] : enabled_vendors) {
+        if (vendor != PresetBundle::ORCA_DEFAULT_BUNDLE && !models.empty()) {
+            has_vendor_printer = true;
+            break;
+        }
+    }
+
+    std::map<std::string, std::string> supplemented_filaments;
+    for (const auto& [name, value] : enabled_filaments) {
+        if (name.size() > system_suffix.size() &&
+            name.compare(name.size() - system_suffix.size(), system_suffix.size(), system_suffix) == 0) {
+            std::string short_name = name.substr(0, name.size() - system_suffix.size());
+            if (has_vendor_printer && has_filament_profiles && m_ProfileJson["filament"].contains(short_name)) {
+                supplemented_filaments[short_name] = value;
+                BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << " Replacing @System filament: '" << name << "' -> '" << short_name << "'";
+                if (has_default_bundle_printer) {
+                    supplemented_filaments[name] = value;
+                    BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << " Also keeping '" << name << "' for default bundle printers";
+                }
+                continue;
+            }
+        }
+        supplemented_filaments[name] = value;
+    }
+
     //update the app_config
-    app_config->set_section(AppConfig::SECTION_FILAMENTS, enabled_filaments);
+    app_config->set_section(AppConfig::SECTION_FILAMENTS, supplemented_filaments);
     app_config->set_vendors(m_appconfig_new);
 
     if (check_unsaved_preset_changes)
         preset_bundle->load_presets(*app_config, ForwardCompatibilitySubstitutionRule::Enable,
                                     {preferred_model, preferred_variant, first_added_filament, std::string()});
 
+    // If the active filament is not in the wizard-selected filaments, switch to the first
+    // compatible wizard-selected filament. This handles the first-run case where load_presets
+    // falls back to "Generic PLA" even though the user selected a different filament.
+    bool active_filament_selected = supplemented_filaments.empty()
+        || supplemented_filaments.count(preset_bundle->filament_presets.front()) > 0;
+    if (!active_filament_selected) {
+        for (const auto& [filament_name, _] : supplemented_filaments) {
+            const Preset* preset = preset_bundle->filaments.find_preset(filament_name);
+            if (preset && preset->is_visible && preset->is_compatible) {
+                preset_bundle->filaments.select_preset_by_name(filament_name, true);
+                preset_bundle->filament_presets.front() = preset_bundle->filaments.get_selected_preset_name();
+                break;
+            }
+        }
+    }
+
     // Update the selections from the compatibilty.
     preset_bundle->export_selections(*app_config);