diff --git a/cura/Settings/ExtruderManager.py b/cura/Settings/ExtruderManager.py
index 5062fc93b4..775596104b 100644
--- a/cura/Settings/ExtruderManager.py
+++ b/cura/Settings/ExtruderManager.py
@@ -221,7 +221,18 @@ class ExtruderManager(QObject):
 
         container_registry.addContainer(container_stack)
 
-    ##  Generates extruders for a specific machine.
+    ##  Removes the container stack and user profile for the extruders for a specific machine.
+    #
+    #   \param machine_id The machine to remove the extruders for.
+    def removeMachineExtruders(self, machine_id):
+        for extruder in self.getMachineExtruders(machine_id):
+            current_settings_id = extruder.getId() + "_current_settings"
+            containers = UM.Settings.ContainerRegistry.getInstance().findInstanceContainers(id = current_settings_id)
+            for container in containers:
+                UM.Settings.ContainerRegistry.getInstance().removeContainer(container.getId())
+            UM.Settings.ContainerRegistry.getInstance().removeContainer(extruder.getId())
+
+    ##  Returns extruders for a specific machine.
     #
     #   \param machine_id The machine to get the extruders of.
     def getMachineExtruders(self, machine_id):
diff --git a/cura/Settings/MachineManager.py b/cura/Settings/MachineManager.py
index 2448139897..cb761032d8 100644
--- a/cura/Settings/MachineManager.py
+++ b/cura/Settings/MachineManager.py
@@ -217,6 +217,8 @@ class MachineManager(QObject):
             quality.nameChanged.disconnect(self._onQualityNameChanged)
 
         self._global_container_stack = Application.getInstance().getGlobalContainerStack()
+        self._active_container_stack = self._global_container_stack
+
         self.globalContainerChanged.emit()
 
         if self._global_container_stack:
@@ -633,6 +635,11 @@ class MachineManager(QObject):
         # If the machine that is being removed is the currently active machine, set another machine as the active machine.
         activate_new_machine = (self._global_container_stack and self._global_container_stack.getId() == machine_id)
 
+        stacks = UM.Settings.ContainerRegistry.getInstance().findContainerStacks(id = machine_id)
+        if not stacks:
+            return
+        ExtruderManager.getInstance().removeMachineExtruders(stacks[0].getBottom().getId())
+
         current_settings_id = machine_id + "_current_settings"
         containers = UM.Settings.ContainerRegistry.getInstance().findInstanceContainers(id = current_settings_id)
         for container in containers:
diff --git a/plugins/PerObjectSettingsTool/PerObjectSettingsTool.py b/plugins/PerObjectSettingsTool/PerObjectSettingsTool.py
index 8b51852c15..b5c4c0f22c 100644
--- a/plugins/PerObjectSettingsTool/PerObjectSettingsTool.py
+++ b/plugins/PerObjectSettingsTool/PerObjectSettingsTool.py
@@ -3,10 +3,12 @@
 
 from UM.Tool import Tool
 from UM.Scene.Selection import Selection
+from UM.Scene.Iterator.DepthFirstIterator import DepthFirstIterator
 from UM.Application import Application
 from UM.Preferences import Preferences
 from cura.Settings.SettingOverrideDecorator import SettingOverrideDecorator
 
+
 ##  This tool allows the user to add & change settings per node in the scene.
 #   The settings per object are kept in a ContainerStack, which is linked to a node by decorator.
 class PerObjectSettingsTool(Tool):
@@ -69,6 +71,11 @@ class PerObjectSettingsTool(Tool):
         global_container_stack = Application.getInstance().getGlobalContainerStack()
         if global_container_stack:
             self._multi_extrusion = global_container_stack.getProperty("machine_extruder_count", "value") > 1
+            if not self._multi_extrusion:
+                # Ensure that all extruder data is reset
+                root_node = Application.getInstance().getController().getScene().getRoot()
+                for node in DepthFirstIterator(root_node):
+                    node.callDecoration("setActiveExtruder", global_container_stack.getId())
             self._updateEnabled()
 
     def _updateEnabled(self):
diff --git a/resources/qml/Preferences/MaterialsPage.qml b/resources/qml/Preferences/MaterialsPage.qml
index 4e0d64ca5e..18059545e2 100644
--- a/resources/qml/Preferences/MaterialsPage.qml
+++ b/resources/qml/Preferences/MaterialsPage.qml
@@ -51,7 +51,13 @@ UM.ManagementPage
     detailsVisible: true
 
     section.property: "section"
-    section.delegate: Label { text: section }
+    section.delegate: Label
+    {
+        text: section
+        font.bold: true
+        anchors.left: parent.left;
+        anchors.leftMargin: UM.Theme.getSize("default_lining").width;
+    }
 
     buttons: [
         Button
diff --git a/resources/qml/Settings/SettingItem.qml b/resources/qml/Settings/SettingItem.qml
index 1e69704995..5e37288f4a 100644
--- a/resources/qml/Settings/SettingItem.qml
+++ b/resources/qml/Settings/SettingItem.qml
@@ -64,7 +64,7 @@ Item {
         return tooltip
     }
 
-    MouseArea 
+    MouseArea
     {
         id: mouse;
 
@@ -114,7 +114,8 @@ Item {
             elide: Text.ElideMiddle;
 
             color: UM.Theme.getColor("setting_control_text");
-            font: UM.Theme.getFont("default");
+            // emphasize the setting if it has a value in the user or quality profile
+            font: base.stackLevel != undefined && base.stackLevel <= 1 ? UM.Theme.getFont("default_italic") : UM.Theme.getFont("default")
         }
 
         Row
diff --git a/resources/themes/cura/theme.json b/resources/themes/cura/theme.json
index 5bc5e99765..053e5e3d84 100644
--- a/resources/themes/cura/theme.json
+++ b/resources/themes/cura/theme.json
@@ -14,6 +14,11 @@
             "bold": true,
             "family": "Open Sans"
         },
+        "default_italic": {
+            "size": 1.15,
+            "italic": true,
+            "family": "Open Sans"
+        },
         "small": {
             "size": 1.0,
             "bold": true,