diff --git a/.github/workflows/printer-linter-format.yml b/.github/workflows/printer-linter-format.yml
index 8e65a481c4..d8e136f156 100644
--- a/.github/workflows/printer-linter-format.yml
+++ b/.github/workflows/printer-linter-format.yml
@@ -16,7 +16,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             -   name: Checkout
-                uses: actions/checkout@v3
+                uses: actions/checkout@v4
 
             -   uses: technote-space/get-diff-action@v6
                 with:
diff --git a/.github/workflows/printer-linter-pr-diagnose.yml b/.github/workflows/printer-linter-pr-diagnose.yml
index ed51f8b2f8..e70cabce7d 100644
--- a/.github/workflows/printer-linter-pr-diagnose.yml
+++ b/.github/workflows/printer-linter-pr-diagnose.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 2
 
@@ -55,7 +55,7 @@ jobs:
           echo ${{ github.event.pull_request.head.repo.full_name }} > printer-linter-result/pr-head-repo.txt
           echo ${{ github.event.pull_request.head.sha }} > printer-linter-result/pr-head-sha.txt
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           name: printer-linter-result
           path: printer-linter-result/
diff --git a/.github/workflows/release-process_release-candidate.yml b/.github/workflows/release-process_release-candidate.yml
index d14701d278..1afb8aad04 100644
--- a/.github/workflows/release-process_release-candidate.yml
+++ b/.github/workflows/release-process_release-candidate.yml
@@ -9,6 +9,11 @@ on:
         required: true
         type: string
 
+      publish_release_description:
+        description: 'Create the GitHub release (if existing, the description will be overridden based on the changelog)'
+        required: true
+        type: boolean
+
 jobs:
   parse-version:
     name: Parse input version string
@@ -153,10 +158,12 @@ jobs:
           ref: ${{ needs.parse-version.outputs.branch_name }}
 
       - name: Extract changelog
+        if: ${{ inputs.publish_release_description }}
         run: python ./scripts/extract_changelog.py --version ${{ needs.parse-version.outputs.version_major }}.${{ needs.parse-version.outputs.version_minor }}.${{ needs.parse-version.outputs.version_patch }} --changelog ./resources/texts/change_log.txt > formatted_changelog.txt
 
       - name: Create release
         uses: notpeelz/action-gh-create-release@v5.0.1
+        if: ${{ inputs.publish_release_description }}
         with:
           target: ${{ needs.create-tags.outputs.main_commit }}
           tag: ${{ inputs.cura_version }}
diff --git a/conandata.yml b/conandata.yml
index 3a2f90bbe1..eda0a7c164 100644
--- a/conandata.yml
+++ b/conandata.yml
@@ -10,7 +10,7 @@ requirements:
   - "pynest2d/5.3.0"
   - "native_cad_plugin/2.0.0"
 requirements_internal:
-  - "fdm_materials/(latest)@internal/testing"
+  - "fdm_materials/5.8.1"
   - "cura_private_data/(latest)@internal/testing"
 urls:
     default:
diff --git a/cura/Machines/Models/QualityManagementModel.py b/cura/Machines/Models/QualityManagementModel.py
index 86e35f6b28..92551dbddf 100644
--- a/cura/Machines/Models/QualityManagementModel.py
+++ b/cura/Machines/Models/QualityManagementModel.py
@@ -127,13 +127,12 @@ class QualityManagementModel(ListModel):
         # have no container for the global stack, because "my_profile" just got renamed to "my_new_profile". This results
         # in crashes because the rest of the system assumes that all data in a QualityChangesGroup will be correct.
         #
-        # Renaming the container for the global stack in the end seems to be ok, because the assumption is mostly based
-        # on the quality changes container for the global stack.
+        # This is why we use the "supress_signals" flag for the set name. This basically makes the change silent.
         for metadata in quality_changes_group.metadata_per_extruder.values():
             extruder_container = cast(InstanceContainer, container_registry.findContainers(id = metadata["id"])[0])
-            extruder_container.setName(new_name)
+            extruder_container.setName(new_name, supress_signals=True)
         global_container = cast(InstanceContainer, container_registry.findContainers(id = quality_changes_group.metadata_for_global["id"])[0])
-        global_container.setName(new_name)
+        global_container.setName(new_name, supress_signals=True)
 
         quality_changes_group.name = new_name
 
diff --git a/cura/Settings/CuraContainerStack.py b/cura/Settings/CuraContainerStack.py
index b5b8a1b721..ef1c9561af 100755
--- a/cura/Settings/CuraContainerStack.py
+++ b/cura/Settings/CuraContainerStack.py
@@ -5,7 +5,7 @@ from typing import Any, cast, List, Optional, Dict
 from PyQt6.QtCore import pyqtProperty, pyqtSignal, QObject
 
 from UM.Application import Application
-from UM.Decorators import override
+from UM.Decorators import CachedMemberFunctions, override
 from UM.FlameProfiler import pyqtSlot
 from UM.Logger import Logger
 from UM.Settings.ContainerStack import ContainerStack, InvalidContainerStackError
@@ -237,6 +237,7 @@ class CuraContainerStack(ContainerStack):
         :param new_value: The new value to set the property to.
         """
 
+        CachedMemberFunctions.clearInstanceCache(self)
         container_index = _ContainerIndexes.UserChanges
         self._containers[container_index].setProperty(key, property_name, property_value, container, set_from_cache)
 
diff --git a/cura/Settings/ExtruderStack.py b/cura/Settings/ExtruderStack.py
index eba41569b7..645abeb0f6 100644
--- a/cura/Settings/ExtruderStack.py
+++ b/cura/Settings/ExtruderStack.py
@@ -5,7 +5,7 @@ from typing import Any, Dict, TYPE_CHECKING, Optional
 
 from PyQt6.QtCore import pyqtProperty, pyqtSignal
 
-from UM.Decorators import override
+from UM.Decorators import CachedMemberFunctions, override
 from UM.MimeTypeDatabase import MimeType, MimeTypeDatabase
 from UM.Settings.ContainerStack import ContainerStack
 from UM.Settings.ContainerRegistry import ContainerRegistry
@@ -86,6 +86,7 @@ class ExtruderStack(CuraContainerStack):
     def setCompatibleMaterialDiameter(self, value: float) -> None:
         old_approximate_diameter = self.getApproximateMaterialDiameter()
         if self.getCompatibleMaterialDiameter() != value:
+            CachedMemberFunctions.clearInstanceCache(self)
             self.definitionChanges.setProperty("material_diameter", "value", value)
             self.compatibleMaterialDiameterChanged.emit()
 
diff --git a/plugins/CuraEngineBackend/CuraEngineBackend.py b/plugins/CuraEngineBackend/CuraEngineBackend.py
index dd7987bc42..a7126af14e 100755
--- a/plugins/CuraEngineBackend/CuraEngineBackend.py
+++ b/plugins/CuraEngineBackend/CuraEngineBackend.py
@@ -197,7 +197,8 @@ class CuraEngineBackend(QObject, Backend):
         self._slicing_error_message.actionTriggered.connect(self._reportBackendError)
 
         self._resetLastSliceTimeStats()
-        self._snapshot: Optional[QImage] = None 
+        self._snapshot: Optional[QImage] = None
+        self._last_socket_error: Optional[Arcus.Error] = None
 
         application.initializationFinished.connect(self.initialize)
 
@@ -569,7 +570,19 @@ class CuraEngineBackend(QObject, Backend):
             return
 
         # Preparation completed, send it to the backend.
-        self._socket.sendMessage(job.getSliceMessage())
+        if not self._socket.sendMessage(job.getSliceMessage()):
+            if self._last_socket_error is not None and self._last_socket_error.getErrorCode() == Arcus.ErrorCode.MessageTooBigError:
+                error_txt = catalog.i18nc("@info:status", "Unable to send the model data to the engine. Please try to use a less detailed model, or reduce the number of instances.")
+            else:
+                error_txt = catalog.i18nc("@info:status", "Unable to send the model data to the engine. Please try again, or contact support.")
+
+            self._error_message = Message(error_txt,
+                                          title=catalog.i18nc("@info:title", "Unable to slice"),
+                                          message_type=Message.MessageType.WARNING)
+            self._error_message.show()
+            self.setState(BackendState.Error)
+            self.backendError.emit(job)
+            return
 
         # Notify the user that it's now up to the backend to do its job
         self.setState(BackendState.Processing)
@@ -691,6 +704,7 @@ class CuraEngineBackend(QObject, Backend):
         if error.getErrorCode() == Arcus.ErrorCode.Debug:
             return
 
+        self._last_socket_error = error
         self._terminate()
         self._createSocket()
 
diff --git a/plugins/CuraEngineBackend/StartSliceJob.py b/plugins/CuraEngineBackend/StartSliceJob.py
index 6da0edb2a7..0789e8a684 100644
--- a/plugins/CuraEngineBackend/StartSliceJob.py
+++ b/plugins/CuraEngineBackend/StartSliceJob.py
@@ -49,7 +49,20 @@ class StartJobResult(IntEnum):
     ObjectsWithDisabledExtruder = 8
 
 
-class GcodeStartEndFormatter(Formatter):
+class GcodeConditionState(IntEnum):
+    OutsideCondition = 1
+    ConditionFalse = 2
+    ConditionTrue = 3
+    ConditionDone = 4
+
+
+class GcodeInstruction(IntEnum):
+    Skip = 1
+    Evaluate = 2
+    EvaluateAndWrite = 3
+
+
+class GcodeStartEndFormatter:
     # Formatter class that handles token expansion in start/end gcode
     # Example of a start/end gcode string:
     # ```
@@ -63,22 +76,50 @@ class GcodeStartEndFormatter(Formatter):
     # will be used. Alternatively, if the expression is formatted as "{[expression], [extruder_nr]}",
     # then the expression will be evaluated with the extruder stack of the specified extruder_nr.
 
-    _extruder_regex = re.compile(r"^\s*(?P<expression>.*)\s*,\s*(?P<extruder_nr_expr>.*)\s*$")
+    _instruction_regex = re.compile(r"{(?P<condition>if|else|elif|endif)?\s*(?P<expression>.*?)\s*(?:,\s*(?P<extruder_nr_expr>.*))?\s*}(?P<end_of_line>\n?)")
 
-    def __init__(self, all_extruder_settings: Dict[str, Any], default_extruder_nr: int = -1) -> None:
+    def __init__(self, all_extruder_settings: Dict[str, Dict[str, Any]], default_extruder_nr: int = -1) -> None:
         super().__init__()
-        self._all_extruder_settings: Dict[str, Any] = all_extruder_settings
+        self._all_extruder_settings: Dict[str, Dict[str, Any]] = all_extruder_settings
         self._default_extruder_nr: int = default_extruder_nr
+        self._cura_application = CuraApplication.getInstance()
+        self._extruder_manager = ExtruderManager.getInstance()
 
-    def get_field(self, field_name, args: [str], kwargs: dict) -> Tuple[str, str]:
-        # get_field method parses all fields in the format-string and parses them individually to the get_value method.
-        # e.g. for a string "Hello {foo.bar}" would the complete field "foo.bar" would be passed to get_field, and then
-        # the individual parts "foo" and "bar" would be passed to get_value. This poses a problem for us, because  want
-        # to parse the entire field as a single expression. To solve this, we override the get_field method and return
-        # the entire field as the expression.
-        return self.get_value(field_name, args, kwargs), field_name
+    def format(self, text: str) -> str:
+        remaining_text: str = text
+        result: str = ""
 
-    def get_value(self, expression: str, args: [str], kwargs: dict) -> str:
+        self._condition_state: GcodeConditionState = GcodeConditionState.OutsideCondition
+
+        while len(remaining_text) > 0:
+            next_code_match = self._instruction_regex.search(remaining_text)
+            if next_code_match is not None:
+                expression_start, expression_end = next_code_match.span()
+
+                if expression_start > 0:
+                    result += self._process_statement(remaining_text[:expression_start])
+
+                result += self._process_code(next_code_match)
+
+                remaining_text = remaining_text[expression_end:]
+
+            else:
+                result += self._process_statement(remaining_text)
+                remaining_text = ""
+
+        return result
+
+    def _process_statement(self, statement: str) -> str:
+        if self._condition_state in [GcodeConditionState.OutsideCondition, GcodeConditionState.ConditionTrue]:
+            return statement
+        else:
+            return ""
+
+    def _process_code(self, code: re.Match) -> str:
+        condition: Optional[str] = code.group("condition")
+        expression: Optional[str] = code.group("expression")
+        extruder_nr_expr: Optional[str] = code.group("extruder_nr_expr")
+        end_of_line: Optional[str] = code.group("end_of_line")
 
         # The following variables are not settings, but only become available after slicing.
         # when these variables are encountered, we return them as-is. They are replaced later
@@ -87,53 +128,100 @@ class GcodeStartEndFormatter(Formatter):
         if expression in post_slice_data_variables:
             return f"{{{expression}}}"
 
-        extruder_nr = str(self._default_extruder_nr)
+        extruder_nr: str = str(self._default_extruder_nr)
+        instruction: GcodeInstruction = GcodeInstruction.Skip
 
         # The settings may specify a specific extruder to use. This is done by
         # formatting the expression as "{expression}, {extruder_nr_expr}". If the
         # expression is formatted like this, we extract the extruder_nr and use
         # it to get the value from the correct extruder stack.
-        match = self._extruder_regex.match(expression)
-        if match:
-            expression = match.group("expression")
-            extruder_nr_expr = match.group("extruder_nr_expr")
-
-            if extruder_nr_expr.isdigit():
-                extruder_nr = extruder_nr_expr
+        if condition is None:
+            # This is a classic statement
+            if self._condition_state in [GcodeConditionState.OutsideCondition, GcodeConditionState.ConditionTrue]:
+                # Skip and move to next
+                instruction = GcodeInstruction.EvaluateAndWrite
+        else:
+            # This is a condition statement, first check validity
+            if condition == "if":
+                if self._condition_state != GcodeConditionState.OutsideCondition:
+                    raise SyntaxError("Nested conditions are not supported")
             else:
-                # We get the value of the extruder_nr_expr from `_all_extruder_settings` dictionary
-                # rather than the global container stack. The `_all_extruder_settings["-1"]` is a
-                # dict-representation of the global container stack, with additional properties such
-                # as `initial_extruder_nr`. As users may enter such expressions we can't use the
-                # global container stack.
-                extruder_nr = str(self._all_extruder_settings["-1"].get(extruder_nr_expr, "-1"))
+                if self._condition_state == GcodeConditionState.OutsideCondition:
+                    raise SyntaxError("Condition should start with an 'if' statement")
 
-        if extruder_nr in self._all_extruder_settings:
-            additional_variables = self._all_extruder_settings[extruder_nr].copy()
-        else:
-            Logger.warning(f"Extruder {extruder_nr} does not exist, using global settings")
-            additional_variables = self._all_extruder_settings["-1"].copy()
+            if condition == "if":
+                # First instruction, just evaluate it
+                instruction = GcodeInstruction.Evaluate
 
-        # Add the arguments and keyword arguments to the additional settings. These
-        # are currently _not_ used, but they are added for consistency with the
-        # base Formatter class.
-        for key, value in enumerate(args):
-            additional_variables[key] = value
-        for key, value in kwargs.items():
-            additional_variables[key] = value
+            else:
+                if self._condition_state == GcodeConditionState.ConditionTrue:
+                    # We have reached the next condition after a valid one has been found, skip the rest
+                    self._condition_state = GcodeConditionState.ConditionDone
 
-        if extruder_nr == "-1":
-            container_stack = CuraApplication.getInstance().getGlobalContainerStack()
-        else:
-            container_stack = ExtruderManager.getInstance().getExtruderStack(extruder_nr)
-            if not container_stack:
+                if condition == "elif":
+                    if self._condition_state == GcodeConditionState.ConditionFalse:
+                        # New instruction, and valid condition has not been reached so far => evaluate it
+                        instruction = GcodeInstruction.Evaluate
+                    else:
+                        # New instruction, but valid condition has already been reached => skip it
+                        instruction = GcodeInstruction.Skip
+
+                elif condition == "else":
+                    instruction = GcodeInstruction.Skip # Never evaluate, expression should be empty
+                    if self._condition_state == GcodeConditionState.ConditionFalse:
+                        # Fallback instruction, and valid condition has not been reached so far => active next
+                        self._condition_state = GcodeConditionState.ConditionTrue
+
+                elif condition == "endif":
+                    instruction = GcodeInstruction.Skip  # Never evaluate, expression should be empty
+                    self._condition_state = GcodeConditionState.OutsideCondition
+
+        if instruction >= GcodeInstruction.Evaluate and extruder_nr_expr is not None:
+            extruder_nr_function = SettingFunction(extruder_nr_expr)
+            container_stack = self._cura_application.getGlobalContainerStack()
+
+            # We add the variables contained in `_all_extruder_settings["-1"]`, which is a dict-representation of the
+            # global container stack, with additional properties such as `initial_extruder_nr`. As users may enter such
+            # expressions we can't use the global container stack. The variables contained in the global container stack
+            # will then be inserted twice, which is not optimal but works well.
+            extruder_nr = str(extruder_nr_function(container_stack, additional_variables=self._all_extruder_settings["-1"]))
+
+        if instruction >= GcodeInstruction.Evaluate:
+            if extruder_nr in self._all_extruder_settings:
+                additional_variables = self._all_extruder_settings[extruder_nr].copy()
+            else:
                 Logger.warning(f"Extruder {extruder_nr} does not exist, using global settings")
-                container_stack = CuraApplication.getInstance().getGlobalContainerStack()
+                additional_variables = self._all_extruder_settings["-1"].copy()
 
-        setting_function = SettingFunction(expression)
-        value = setting_function(container_stack, additional_variables=additional_variables)
+            if extruder_nr == "-1":
+                container_stack = self._cura_application.getGlobalContainerStack()
+            else:
+                container_stack = self._extruder_manager.getExtruderStack(extruder_nr)
+                if not container_stack:
+                    Logger.warning(f"Extruder {extruder_nr} does not exist, using global settings")
+                    container_stack = self._cura_application.getGlobalContainerStack()
 
-        return value
+            setting_function = SettingFunction(expression)
+            value = setting_function(container_stack, additional_variables=additional_variables)
+
+            if instruction == GcodeInstruction.Evaluate:
+                if value:
+                    self._condition_state = GcodeConditionState.ConditionTrue
+                else:
+                    self._condition_state = GcodeConditionState.ConditionFalse
+
+                return ""
+            else:
+                value_str = str(value)
+
+                if end_of_line is not None:
+                    # If we are evaluating an expression that is not a condition, restore the end of line
+                    value_str += end_of_line
+
+                return value_str
+
+        else:
+            return ""
 
 
 class StartSliceJob(Job):
@@ -470,6 +558,9 @@ class StartSliceJob(Job):
         result["day"] = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"][int(time.strftime("%w"))]
         result["initial_extruder_nr"] = CuraApplication.getInstance().getExtruderManager().getInitialExtruderNr()
 
+        # If adding or changing a setting here, please update the associated wiki page
+        # https://github.com/Ultimaker/Cura/wiki/Start-End-G%E2%80%90Code
+
         return result
 
     def _cacheAllExtruderSettings(self):
diff --git a/plugins/MachineSettingsAction/MachineSettingsExtruderTab.qml b/plugins/MachineSettingsAction/MachineSettingsExtruderTab.qml
index 5e1ddc2f3f..ab7442bd4e 100644
--- a/plugins/MachineSettingsAction/MachineSettingsExtruderTab.qml
+++ b/plugins/MachineSettingsAction/MachineSettingsExtruderTab.qml
@@ -182,7 +182,7 @@ Item
         Cura.GcodeTextArea   // "Extruder Start G-code"
         {
             anchors.top: parent.top
-            anchors.bottom: parent.bottom
+            anchors.bottom: buttonLearnMore.top
             anchors.bottomMargin: UM.Theme.getSize("default_margin").height
             anchors.left: parent.left
             width: base.columnWidth - UM.Theme.getSize("default_margin").width
@@ -196,7 +196,7 @@ Item
         Cura.GcodeTextArea   // "Extruder End G-code"
         {
             anchors.top: parent.top
-            anchors.bottom: parent.bottom
+            anchors.bottom: buttonLearnMore.top
             anchors.bottomMargin: UM.Theme.getSize("default_margin").height
             anchors.right: parent.right
             width: base.columnWidth - UM.Theme.getSize("default_margin").width
@@ -206,5 +206,17 @@ Item
             settingKey: "machine_extruder_end_code"
             settingStoreIndex: propertyStoreIndex
         }
+
+        Cura.TertiaryButton
+        {
+            id: buttonLearnMore
+
+            text: catalog.i18nc("@button", "Learn more")
+            iconSource: UM.Theme.getIcon("LinkExternal")
+            isIconOnRightSide: true
+            onClicked: Qt.openUrlExternally("https://github.com/Ultimaker/Cura/wiki/Start-End-G%E2%80%90Code")
+            anchors.bottom: parent.bottom
+            anchors.right: parent.right
+        }
     }
 }
diff --git a/plugins/MachineSettingsAction/MachineSettingsPrinterTab.qml b/plugins/MachineSettingsAction/MachineSettingsPrinterTab.qml
index 740e248828..b01060c1df 100644
--- a/plugins/MachineSettingsAction/MachineSettingsPrinterTab.qml
+++ b/plugins/MachineSettingsAction/MachineSettingsPrinterTab.qml
@@ -376,7 +376,7 @@ Item
         anchors
         {
             top: upperBlock.bottom
-            bottom: parent.bottom
+            bottom: buttonLearnMore.top
             left: parent.left
             right: parent.right
             margins: UM.Theme.getSize("default_margin").width
@@ -403,5 +403,19 @@ Item
             settingKey: "machine_end_gcode"
             settingStoreIndex: propertyStoreIndex
         }
+
+    }
+
+    Cura.TertiaryButton
+    {
+        id: buttonLearnMore
+
+        text: catalog.i18nc("@button", "Learn more")
+        iconSource: UM.Theme.getIcon("LinkExternal")
+        isIconOnRightSide: true
+        onClicked: Qt.openUrlExternally("https://github.com/Ultimaker/Cura/wiki/Start-End-G%E2%80%90Code")
+        anchors.bottom: parent.bottom
+        anchors.right: parent.right
+        anchors.margins: UM.Theme.getSize("default_margin").width
     }
 }
diff --git a/plugins/XmlMaterialProfile/XmlMaterialProfile.py b/plugins/XmlMaterialProfile/XmlMaterialProfile.py
index 13111c1c7a..eb2bb2a788 100644
--- a/plugins/XmlMaterialProfile/XmlMaterialProfile.py
+++ b/plugins/XmlMaterialProfile/XmlMaterialProfile.py
@@ -11,6 +11,7 @@ import xml.etree.ElementTree as ET
 from UM.PluginRegistry import PluginRegistry
 from UM.Resources import Resources
 from UM.Logger import Logger
+from UM.Decorators import CachedMemberFunctions
 import UM.Dictionary
 from UM.Settings.InstanceContainer import InstanceContainer
 from UM.Settings.ContainerRegistry import ContainerRegistry
@@ -71,6 +72,8 @@ class XmlMaterialProfile(InstanceContainer):
             Logger.log("w", "Can't change metadata {key} of material {material_id} because it's read-only.".format(key = key, material_id = self.getId()))
             return
 
+        CachedMemberFunctions.clearInstanceCache(self)
+
         # Some metadata such as diameter should also be instantiated to be a setting. Go though all values for the
         # "properties" field and apply the new values to SettingInstances as well.
         new_setting_values_dict = {}
@@ -480,6 +483,7 @@ class XmlMaterialProfile(InstanceContainer):
                     first.append(element)
 
     def clearData(self):
+        CachedMemberFunctions.clearInstanceCache(self)
         self._metadata = {
             "id": self.getId(),
             "name": ""
@@ -519,6 +523,8 @@ class XmlMaterialProfile(InstanceContainer):
     def deserialize(self, serialized, file_name = None):
         """Overridden from InstanceContainer"""
 
+        CachedMemberFunctions.clearInstanceCache(self)
+
         containers_to_add = []
         # update the serialized data first
         from UM.Settings.Interfaces import ContainerInterface
diff --git a/resources/conandata.yml b/resources/conandata.yml
index d43b7d4dd2..9e4e8b5271 100644
--- a/resources/conandata.yml
+++ b/resources/conandata.yml
@@ -1 +1 @@
-version: "5.8.0"
+version: "5.9.0-alpha.0"
diff --git a/resources/definitions/fdmextruder.def.json b/resources/definitions/fdmextruder.def.json
index a0fffeeaec..101efee3b1 100644
--- a/resources/definitions/fdmextruder.def.json
+++ b/resources/definitions/fdmextruder.def.json
@@ -172,7 +172,6 @@
                     "default_value": 3,
                     "description": "The height difference between the tip of the nozzle and the lowest part of the print head.",
                     "label": "Nozzle Length",
-                    "settable_globally": false,
                     "settable_per_extruder": true,
                     "settable_per_mesh": false,
                     "settable_per_meshgroup": false,
diff --git a/resources/definitions/ultimaker.def.json b/resources/definitions/ultimaker.def.json
index 21e905fdf8..14c7f6d0e0 100644
--- a/resources/definitions/ultimaker.def.json
+++ b/resources/definitions/ultimaker.def.json
@@ -70,14 +70,12 @@
         "machine_max_feedrate_e": { "default_value": 45 },
         "material_bed_temperature":
         {
-            "maximum_value": "140",
-            "maximum_value_warning": "120",
+            "maximum_value": "120",
             "minimum_value": "0"
         },
         "material_bed_temperature_layer_0":
         {
-            "maximum_value": "140",
-            "maximum_value_warning": "120",
+            "maximum_value": "120",
             "minimum_value": "0"
         },
         "material_print_temp_wait": { "value": false },
diff --git a/resources/definitions/ultimaker_factor4.def.json b/resources/definitions/ultimaker_factor4.def.json
index 573b26cf50..5945d3a262 100644
--- a/resources/definitions/ultimaker_factor4.def.json
+++ b/resources/definitions/ultimaker_factor4.def.json
@@ -112,10 +112,10 @@
         "machine_head_with_fans_polygon":
         {
             "default_value": [
-                [-30, -80],
-                [-30, 20],
-                [50, 20],
-                [50, -80]
+                [-35, -80],
+                [-35, 30],
+                [55, 30],
+                [55, -80]
             ]
         },
         "machine_heated_bed": { "default_value": true },
diff --git a/resources/qml/Actions.qml b/resources/qml/Actions.qml
index 7acf39ecb2..0c673a9409 100644
--- a/resources/qml/Actions.qml
+++ b/resources/qml/Actions.qml
@@ -62,7 +62,6 @@ Item
 
     property alias showProfileFolder: showProfileFolderAction
     property alias documentation: documentationAction
-    property alias showTroubleshooting: showTroubleShootingAction
     property alias openSponsershipPage: openSponsershipPageAction
     property alias reportBug: reportBugAction
     property alias whatsNew: whatsNewAction
@@ -86,14 +85,6 @@ Item
 
     UM.I18nCatalog{id: catalog; name: "cura"}
 
-
-    Action
-    {
-        id: showTroubleShootingAction
-        onTriggered: Qt.openUrlExternally("https://ultimaker.com/en/troubleshooting?utm_source=cura&utm_medium=software&utm_campaign=dropdown-troubleshooting")
-        text: catalog.i18nc("@action:inmenu", "Show Online Troubleshooting")
-    }
-
     Action
     {
         id: openSponsershipPageAction
diff --git a/resources/qml/MachineSettings/GcodeTextArea.qml b/resources/qml/MachineSettings/GcodeTextArea.qml
index 2538cd9f65..05d3711bae 100644
--- a/resources/qml/MachineSettings/GcodeTextArea.qml
+++ b/resources/qml/MachineSettings/GcodeTextArea.qml
@@ -12,20 +12,16 @@ import Cura 1.1 as Cura
 //
 // TextArea widget for editing Gcode in the Machine Settings dialog.
 //
-UM.TooltipArea
+Item
 {
     id: control
 
     UM.I18nCatalog { id: catalog; name: "cura"; }
 
-    text: tooltip
-
     property alias containerStackId: propertyProvider.containerStackId
     property alias settingKey: propertyProvider.key
     property alias settingStoreIndex: propertyProvider.storeIndex
 
-    property string tooltip: propertyProvider.properties.description ? propertyProvider.properties.description : ""
-
     property alias labelText: titleLabel.text
     property alias labelFont: titleLabel.font
 
diff --git a/resources/qml/Menus/HelpMenu.qml b/resources/qml/Menus/HelpMenu.qml
index 6a57a99515..c257db0527 100644
--- a/resources/qml/Menus/HelpMenu.qml
+++ b/resources/qml/Menus/HelpMenu.qml
@@ -14,7 +14,6 @@ Cura.Menu
     title: catalog.i18nc("@title:menu menubar:toplevel", "&Help")
 
     Cura.MenuItem { action: Cura.Actions.showProfileFolder }
-    Cura.MenuItem { action: Cura.Actions.showTroubleshooting}
     Cura.MenuItem { action: Cura.Actions.documentation }
     Cura.MenuItem { action: Cura.Actions.reportBug }
     Cura.MenuItem { action: Cura.Actions.openSponsershipPage }
diff --git a/resources/quality/ultimaker_factor4/um_f4_aa0.8_tpu_0.3mm.inst.cfg b/resources/quality/ultimaker_factor4/um_f4_aa0.8_tpu_0.3mm.inst.cfg
new file mode 100644
index 0000000000..7949c64afc
--- /dev/null
+++ b/resources/quality/ultimaker_factor4/um_f4_aa0.8_tpu_0.3mm.inst.cfg
@@ -0,0 +1,26 @@
+[general]
+definition = ultimaker_factor4
+name = Extra Fast
+version = 4
+
+[metadata]
+material = generic_tpu
+quality_type = verydraft
+setting_version = 23
+type = quality
+variant = AA 0.8
+weight = -3
+
+[values]
+gradual_flow_discretisation_step_size = 0.1
+gradual_flow_enabled = True
+infill_pattern = ='zigzag' if infill_sparse_density > 50 else 'cross_3d'
+infill_sparse_density = 20
+inset_direction = outside_in
+material_print_temperature = =default_material_print_temperature + 5
+max_flow_acceleration = 1
+skin_material_flow = =material_flow * 0.9
+skin_material_flow_layer_0 = 90
+speed_layer_0 = 20
+speed_print = 35
+
diff --git a/resources/quality/ultimaker_factor4/um_f4_aa0.8_tpu_0.4mm.inst.cfg b/resources/quality/ultimaker_factor4/um_f4_aa0.8_tpu_0.4mm.inst.cfg
new file mode 100644
index 0000000000..4b1d25bd18
--- /dev/null
+++ b/resources/quality/ultimaker_factor4/um_f4_aa0.8_tpu_0.4mm.inst.cfg
@@ -0,0 +1,26 @@
+[general]
+definition = ultimaker_factor4
+name = Sprint
+version = 4
+
+[metadata]
+material = generic_tpu
+quality_type = superdraft
+setting_version = 23
+type = quality
+variant = AA 0.8
+weight = -4
+
+[values]
+gradual_flow_discretisation_step_size = 0.1
+gradual_flow_enabled = True
+infill_pattern = ='zigzag' if infill_sparse_density > 50 else 'cross_3d'
+infill_sparse_density = 20
+inset_direction = outside_in
+material_print_temperature = =default_material_print_temperature + 8
+max_flow_acceleration = 1
+skin_material_flow = =material_flow * 0.9
+skin_material_flow_layer_0 = 90
+speed_layer_0 = 20
+speed_print = 35
+
diff --git a/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.15mm.inst.cfg b/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.15mm.inst.cfg
index 3294a3a150..37e9bb8b73 100644
--- a/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.15mm.inst.cfg
+++ b/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.15mm.inst.cfg
@@ -12,20 +12,32 @@ variant = BB 0.4
 weight = -1
 
 [values]
+acceleration_print = 1000.0
 acceleration_support_bottom = 100
-acceleration_support_interface = 1500
+acceleration_support_interface = 1000
 brim_replaces_support = False
 build_volume_temperature = =40 if extruders_enabled_count > 1 else 35
 default_material_bed_temperature = =0 if extruders_enabled_count > 1 else 60
 gradual_flow_discretisation_step_size = 0.1
 gradual_flow_enabled = True
-initial_layer_line_width_factor = 150
+gradual_support_infill_steps = 0
+initial_layer_line_width_factor = 125
+jerk_print = 10
+material_flow_layer_0 = 90
 max_flow_acceleration = 1
 minimum_support_area = 4
+prime_tower_flow = 90
 prime_tower_min_volume = 15
+retraction_min_travel = 5.0
+retraction_prime_speed = 10.0
 skin_material_flow = =material_flow * 0.93
+speed_print = 30
+support_angle = 45
+support_infill_rate = 20
 support_infill_sparse_thickness = =min(layer_height * 2, machine_nozzle_size * 3 / 4) if layer_height <= 0.15 / 0.4 * machine_nozzle_size else layer_height
 support_interface_offset = 1
 support_offset = 3
+support_xy_distance = 2
 support_z_distance = 0
+switch_extruder_prime_speed = 10.0
 
diff --git a/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.1mm.inst.cfg b/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.1mm.inst.cfg
index 0f10e4f507..4c83276641 100644
--- a/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.1mm.inst.cfg
+++ b/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.1mm.inst.cfg
@@ -12,21 +12,32 @@ variant = BB 0.4
 weight = 0
 
 [values]
+acceleration_print = 1000.0
 acceleration_support_bottom = 100
-acceleration_support_interface = 1500
+acceleration_support_interface = 1000
 brim_replaces_support = False
 build_volume_temperature = =40 if extruders_enabled_count > 1 else 35
 default_material_bed_temperature = =0 if extruders_enabled_count > 1 else 60
 gradual_flow_discretisation_step_size = 0.1
 gradual_flow_enabled = True
-initial_layer_line_width_factor = 150
+gradual_support_infill_steps = 0
+initial_layer_line_width_factor = 125
+jerk_print = 10
+material_flow_layer_0 = 90
 max_flow_acceleration = 1
 minimum_support_area = 4
+prime_tower_flow = 90
 prime_tower_min_volume = 15
+retraction_min_travel = 5.0
+retraction_prime_speed = 10.0
 skin_material_flow = =material_flow * 0.93
-speed_print = 50
+speed_print = 30
+support_angle = 45
+support_infill_rate = 20
 support_infill_sparse_thickness = =min(layer_height * 2, machine_nozzle_size * 3 / 4) if layer_height <= 0.15 / 0.4 * machine_nozzle_size else layer_height
 support_interface_offset = 1
 support_offset = 3
+support_xy_distance = 2
 support_z_distance = 0
+switch_extruder_prime_speed = 10.0
 
diff --git a/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.2mm.inst.cfg b/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.2mm.inst.cfg
index ef920e6fd7..93f62df983 100644
--- a/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.2mm.inst.cfg
+++ b/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.2mm.inst.cfg
@@ -12,21 +12,32 @@ variant = BB 0.4
 weight = -2
 
 [values]
+acceleration_print = 1000.0
 acceleration_support_bottom = 100
-acceleration_support_interface = 1500
+acceleration_support_interface = 1000
 brim_replaces_support = False
 build_volume_temperature = =40 if extruders_enabled_count > 1 else 35
 default_material_bed_temperature = =0 if extruders_enabled_count > 1 else 60
 gradual_flow_discretisation_step_size = 0.1
 gradual_flow_enabled = True
-initial_layer_line_width_factor = 150
+gradual_support_infill_steps = 0
+initial_layer_line_width_factor = 125
+jerk_print = 10
+material_flow_layer_0 = 90
 max_flow_acceleration = 1
 minimum_support_area = 4
+prime_tower_flow = 90
 prime_tower_min_volume = 15
+retraction_min_travel = 5.0
+retraction_prime_speed = 10.0
 skin_material_flow = =material_flow * 0.93
-speed_print = 50
+speed_print = 30
+support_angle = 45
+support_infill_rate = 20
 support_infill_sparse_thickness = =min(layer_height * 2, machine_nozzle_size * 3 / 4) if layer_height <= 0.15 / 0.4 * machine_nozzle_size else layer_height
 support_interface_offset = 1
 support_offset = 3
+support_xy_distance = 2
 support_z_distance = 0
+switch_extruder_prime_speed = 10.0
 
diff --git a/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.3mm.inst.cfg b/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.3mm.inst.cfg
index 4165a27a58..0d946c0092 100644
--- a/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.3mm.inst.cfg
+++ b/resources/quality/ultimaker_factor4/um_f4_bb0.4_pva_0.3mm.inst.cfg
@@ -12,21 +12,32 @@ variant = BB 0.4
 weight = -3
 
 [values]
+acceleration_print = 1000.0
 acceleration_support_bottom = 100
-acceleration_support_interface = 1500
+acceleration_support_interface = 1000
 brim_replaces_support = False
 build_volume_temperature = =40 if extruders_enabled_count > 1 else 35
 default_material_bed_temperature = =0 if extruders_enabled_count > 1 else 60
 gradual_flow_discretisation_step_size = 0.1
 gradual_flow_enabled = True
-initial_layer_line_width_factor = 150
+gradual_support_infill_steps = 0
+initial_layer_line_width_factor = 125
+jerk_print = 10
+material_flow_layer_0 = 90
 max_flow_acceleration = 1
 minimum_support_area = 4
+prime_tower_flow = 90
 prime_tower_min_volume = 15
+retraction_min_travel = 5.0
+retraction_prime_speed = 10.0
 skin_material_flow = =material_flow * 0.93
-speed_print = 40
+speed_print = 30
+support_angle = 45
+support_infill_rate = 20
 support_infill_sparse_thickness = =min(layer_height * 2, machine_nozzle_size * 3 / 4) if layer_height <= 0.15 / 0.4 * machine_nozzle_size else layer_height
 support_interface_offset = 1
 support_offset = 3
+support_xy_distance = 2
 support_z_distance = 0
+switch_extruder_prime_speed = 10.0
 
diff --git a/resources/quality/ultimaker_factor4/um_f4_bb0.8_pva_0.2mm.inst.cfg b/resources/quality/ultimaker_factor4/um_f4_bb0.8_pva_0.2mm.inst.cfg
index 2963265eec..148a82c991 100644
--- a/resources/quality/ultimaker_factor4/um_f4_bb0.8_pva_0.2mm.inst.cfg
+++ b/resources/quality/ultimaker_factor4/um_f4_bb0.8_pva_0.2mm.inst.cfg
@@ -12,20 +12,32 @@ variant = BB 0.8
 weight = -2
 
 [values]
+acceleration_print = 1000.0
 acceleration_support_bottom = 100
-acceleration_support_interface = 1500
+acceleration_support_interface = 1000
 brim_replaces_support = False
 build_volume_temperature = =40 if extruders_enabled_count > 1 else 35
 default_material_bed_temperature = =0 if extruders_enabled_count > 1 else 60
 gradual_flow_discretisation_step_size = 0.1
 gradual_flow_enabled = True
-initial_layer_line_width_factor = 150
+gradual_support_infill_steps = 0
+initial_layer_line_width_factor = 125
+jerk_print = 10
+material_flow_layer_0 = 90
 max_flow_acceleration = 1
 minimum_support_area = 4
+prime_tower_flow = 90
 prime_tower_min_volume = 15
+retraction_min_travel = 5.0
+retraction_prime_speed = 10.0
 skin_material_flow = =material_flow * 0.93
+speed_print = 30
+support_angle = 45
+support_infill_rate = 20
 support_infill_sparse_thickness = =min(layer_height * 2, machine_nozzle_size * 3 / 4) if layer_height <= 0.15 / 0.4 * machine_nozzle_size else layer_height
 support_interface_offset = 1
 support_offset = 3
+support_xy_distance = 2
 support_z_distance = 0
+switch_extruder_prime_speed = 10.0
 
diff --git a/resources/quality/ultimaker_factor4/um_f4_bb0.8_pva_0.3mm.inst.cfg b/resources/quality/ultimaker_factor4/um_f4_bb0.8_pva_0.3mm.inst.cfg
index 0a1437fd30..8ab2146046 100644
--- a/resources/quality/ultimaker_factor4/um_f4_bb0.8_pva_0.3mm.inst.cfg
+++ b/resources/quality/ultimaker_factor4/um_f4_bb0.8_pva_0.3mm.inst.cfg
@@ -12,20 +12,32 @@ variant = BB 0.8
 weight = -3
 
 [values]
+acceleration_print = 1000.0
 acceleration_support_bottom = 100
-acceleration_support_interface = 1500
+acceleration_support_interface = 1000
 brim_replaces_support = False
 build_volume_temperature = =40 if extruders_enabled_count > 1 else 35
 default_material_bed_temperature = =0 if extruders_enabled_count > 1 else 60
 gradual_flow_discretisation_step_size = 0.1
 gradual_flow_enabled = True
-initial_layer_line_width_factor = 150
+gradual_support_infill_steps = 0
+initial_layer_line_width_factor = 125
+jerk_print = 10
+material_flow_layer_0 = 90
 max_flow_acceleration = 1
 minimum_support_area = 4
+prime_tower_flow = 90
 prime_tower_min_volume = 15
+retraction_min_travel = 5.0
+retraction_prime_speed = 10.0
 skin_material_flow = =material_flow * 0.93
+speed_print = 30
+support_angle = 45
+support_infill_rate = 20
 support_infill_sparse_thickness = =min(layer_height * 2, machine_nozzle_size * 3 / 4) if layer_height <= 0.15 / 0.4 * machine_nozzle_size else layer_height
 support_interface_offset = 1
 support_offset = 3
+support_xy_distance = 2
 support_z_distance = 0
+switch_extruder_prime_speed = 10.0
 
diff --git a/resources/quality/ultimaker_factor4/um_f4_bb0.8_pva_0.4mm.inst.cfg b/resources/quality/ultimaker_factor4/um_f4_bb0.8_pva_0.4mm.inst.cfg
index edd837f8fc..52134575b0 100644
--- a/resources/quality/ultimaker_factor4/um_f4_bb0.8_pva_0.4mm.inst.cfg
+++ b/resources/quality/ultimaker_factor4/um_f4_bb0.8_pva_0.4mm.inst.cfg
@@ -12,20 +12,32 @@ variant = BB 0.8
 weight = -4
 
 [values]
+acceleration_print = 1000.0
 acceleration_support_bottom = 100
-acceleration_support_interface = 1500
+acceleration_support_interface = 1000
 brim_replaces_support = False
 build_volume_temperature = =40 if extruders_enabled_count > 1 else 35
 default_material_bed_temperature = =0 if extruders_enabled_count > 1 else 60
 gradual_flow_discretisation_step_size = 0.1
 gradual_flow_enabled = True
-initial_layer_line_width_factor = 150
+gradual_support_infill_steps = 0
+initial_layer_line_width_factor = 125
+jerk_print = 10
+material_flow_layer_0 = 90
 max_flow_acceleration = 1
 minimum_support_area = 4
+prime_tower_flow = 90
 prime_tower_min_volume = 15
+retraction_min_travel = 5.0
+retraction_prime_speed = 10.0
 skin_material_flow = =material_flow * 0.93
+speed_print = 30
+support_angle = 45
+support_infill_rate = 20
 support_infill_sparse_thickness = =min(layer_height * 2, machine_nozzle_size * 3 / 4) if layer_height <= 0.15 / 0.4 * machine_nozzle_size else layer_height
 support_interface_offset = 1
 support_offset = 3
+support_xy_distance = 2
 support_z_distance = 0
+switch_extruder_prime_speed = 10.0
 
diff --git a/resources/quality/ultimaker_factor4/um_f4_global_Verydraft_Quality.inst.cfg b/resources/quality/ultimaker_factor4/um_f4_global_Verydraft_Quality.inst.cfg
index 6aa1be79a3..48feef8723 100644
--- a/resources/quality/ultimaker_factor4/um_f4_global_Verydraft_Quality.inst.cfg
+++ b/resources/quality/ultimaker_factor4/um_f4_global_Verydraft_Quality.inst.cfg
@@ -1,6 +1,6 @@
 [general]
 definition = ultimaker_factor4
-name = Sprint
+name = Extra Fast
 version = 4
 
 [metadata]
diff --git a/resources/texts/change_log.txt b/resources/texts/change_log.txt
index cb5aa3d2a6..237caedea9 100644
--- a/resources/texts/change_log.txt
+++ b/resources/texts/change_log.txt
@@ -1,3 +1,11 @@
+[5.8.1]
+
+* Bug fixes:
+- Fixed an issue where materials could not be synced to UltiMaker Printers
+
+* Profile Improvements
+- Significant improvements for PVA and TPU 95A profiles for UltiMaker Factor 4
+
 [5.8]
 
 * New Z Seam Settings:
diff --git a/tests/Machines/TestStartEndGCode.py b/tests/Machines/TestStartEndGCode.py
new file mode 100644
index 0000000000..13c14f5acc
--- /dev/null
+++ b/tests/Machines/TestStartEndGCode.py
@@ -0,0 +1,310 @@
+# Copyright (c) 2024 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+import pytest
+from unittest.mock import MagicMock
+
+from plugins.CuraEngineBackend.StartSliceJob import GcodeStartEndFormatter
+
+
+# def createMockedInstanceContainer(container_id):
+#     result = MagicMock()
+#     result.getId = MagicMock(return_value=container_id)
+#     result.getMetaDataEntry = MagicMock(side_effect=getMetadataEntrySideEffect)
+#     return result
+
+class MockValueProvider:
+    ##  Creates a mock value provider.
+    #
+    #   This initialises a dictionary with key-value pairs.
+    def __init__(self, values):
+        self._values = values
+
+    ##  Provides a value.
+    #
+    #   \param name The key of the value to provide.
+    def getProperty(self, key, property_name, context = None):
+        if not (key in self._values):
+            return None
+        return self._values[key]
+
+extruder_0_values = {
+    "material_temperature": 190.0
+}
+
+extruder_1_values = {
+    "material_temperature": 210.0
+}
+
+global_values = {
+    "bed_temperature": 50.0,
+    "initial_extruder": 0
+}
+
+extruder_0_provider = MockValueProvider(extruder_0_values)
+extruder_1_provider = MockValueProvider(extruder_1_values)
+
+all_extruder_settings = {"-1": global_values, "0": extruder_0_values, "1": extruder_1_values}
+
+test_cases = [
+    ('Static code', None, 'G0', 'G0'),
+
+    ('Basic replacement', None, 'M128 {bed_temperature}', 'M128 50.0'),
+
+    (
+        'Conditional expression with global setting',
+        None,
+'''{if bed_temperature > 30}
+G123
+{else}
+G456
+{endif}''',
+'''G123
+'''
+    ),
+
+    (
+        'Conditional expression with extruder setting directly specified by index 0',
+        None,
+'''{if material_temperature > 200, 0}
+G10
+{else}
+G20
+{endif}''',
+'''G20
+'''
+    ),
+    (
+        'Conditional expression with extruder setting directly specified by index 1',
+        None,
+'''{if material_temperature > 200, 1}
+G100
+{else}
+G200
+{endif}''',
+'''G100
+'''
+    ),
+
+    (
+        'Conditional expression with extruder index specified by setting',
+        None,
+'''{if material_temperature > 200, initial_extruder}
+G1000
+{else}
+G2000
+{endif}''',
+'''G2000
+'''
+    ),
+
+    (
+        'Conditional expression with extruder index specified by formula',
+        None,
+'''{if material_temperature > 200, (initial_extruder + 1) % 2}
+X1000
+{else}
+X2000
+{endif}''',
+'''X1000
+'''
+    ),
+
+    (
+        'Conditional expression with elsif',
+        None,
+'''{if bed_temperature < 30}
+T30
+{elif bed_temperature >= 30 and bed_temperature < 40}
+T40
+{elif bed_temperature >= 40 and bed_temperature < 50}
+T50
+{elif bed_temperature >= 50 and bed_temperature < 60}
+T60
+{elif bed_temperature >= 60 and bed_temperature < 70}
+T70
+{else}
+T-800
+{endif}''',
+'''T60
+'''
+    ),
+
+    (
+        'Formula inside a conditional expression',
+        None,
+'''{if bed_temperature < 30}
+Z000
+{else}
+Z{bed_temperature + 10}
+{endif}''',
+'''Z60.0
+'''
+    ),
+
+    (
+        'Other commands around conditional expression',
+        None,
+'''
+R000
+# My super initial command
+R111 X123 Y456 Z789
+{if bed_temperature > 30}
+R987
+R654 X321
+{else}
+R963 X852 Y741
+R321 X654 Y987
+{endif}
+# And finally, the end of the start at the beginning of the header
+R369
+R357 X951 Y843''',
+'''
+R000
+# My super initial command
+R111 X123 Y456 Z789
+R987
+R654 X321
+# And finally, the end of the start at the beginning of the header
+R369
+R357 X951 Y843'''
+    ),
+
+    (
+        'Multiple conditional expressions',
+        None,
+'''
+A999
+{if bed_temperature > 30}
+A000
+{else}
+A100
+{endif}
+A888
+{if material_temperature > 200, 0}
+A200
+{else}
+A300
+{endif}
+A777
+''',
+'''
+A999
+A000
+A888
+A300
+A777
+'''
+    ),
+
+    (
+        'Nested condition expression',
+        SyntaxError,
+'''{if bed_temperature < 30}
+{if material_temperature < 30, 0}
+M000
+{else}
+M888
+{endif}
+{else}
+M{bed_temperature + 10}
+{endif}''',
+        ''
+    ),
+
+    (
+        'Wrong condition expression',
+        SyntaxError,
+'''{of material_temperature > 200, 1}
+G100
+{else}
+G200
+{endif}''',
+        ''
+    ),
+
+    (
+        'Condition expression without start',
+        SyntaxError,
+'''
+W100
+{else}
+W200
+{endif}''',
+        ''
+    ),
+
+    (
+        'Formula with non-existing variable',
+        None,
+        '{material_storage_temperature}',
+        '0'
+    ),
+
+    (
+        'Missing formula end character',
+        None,
+        '{material_temperature, 0',
+        '{material_temperature, 0'
+    ),
+
+    (
+        'Conditional expression with missing end character',
+        SyntaxError,
+'''{if material_temperature > 200, 0
+Q1000
+{else}
+Q2000
+{endif}''',
+        ''
+    ),
+
+(
+        'Unexpected end character',
+        None,
+'''{if material_temperature > 200, 0}}
+S1000
+{else}
+S2000
+{endif}''',
+'''S2000
+'''
+    ),
+]
+
+def pytest_generate_tests(metafunc):
+    if "original_gcode" in metafunc.fixturenames:
+        tests_ids = [test[0] for test in test_cases]
+        tests_data = [test[1:] for test in test_cases]
+        metafunc.parametrize("exception_type, original_gcode, expected_gcode", tests_data, ids = tests_ids)
+
+@pytest.fixture
+def cura_application():
+    result = MagicMock()
+    result.getGlobalContainerStack = MagicMock(return_value = MockValueProvider(global_values))
+    return result
+
+@pytest.fixture
+def extruder_manager():
+    def get_extruder(extruder_nr: str):
+        if extruder_nr == "0":
+            return extruder_0_provider
+        elif extruder_nr == "1":
+            return extruder_1_provider
+        else:
+            return None
+
+    result = MagicMock()
+    result.getExtruderStack = MagicMock(side_effect = get_extruder)
+    return result
+
+def test_startEndGCode_replace(cura_application, extruder_manager, exception_type, original_gcode, expected_gcode):
+    formatter = GcodeStartEndFormatter(all_extruder_settings, -1)
+    formatter._cura_application = cura_application
+    formatter._extruder_manager = extruder_manager
+
+    if exception_type is not None:
+        with pytest.raises(exception_type):
+            formatter.format(original_gcode)
+    else:
+        assert formatter.format(original_gcode) == expected_gcode