diff --git a/cura/CuraApplication.py b/cura/CuraApplication.py
index a4d7bc303e..19f8174a95 100755
--- a/cura/CuraApplication.py
+++ b/cura/CuraApplication.py
@@ -207,6 +207,7 @@ class CuraApplication(QtApplication):
         self._first_start_machine_actions_model = None
         self._welcome_pages_model = WelcomePagesModel(self, parent = self)
         self._add_printer_pages_model = AddPrinterPagesModel(self, parent = self)
+        self._add_printer_pages_model_without_cancel = AddPrinterPagesModel(self, parent = self)
         self._whats_new_pages_model = WhatsNewPagesModel(self, parent = self)
         self._text_manager = TextManager(parent = self)
 
@@ -647,7 +648,7 @@ class CuraApplication(QtApplication):
         return self._global_container_stack
 
     @override(Application)
-    def setGlobalContainerStack(self, stack: "GlobalStack") -> None:
+    def setGlobalContainerStack(self, stack: Optional["GlobalStack"]) -> None:
         self._setLoadingHint(self._i18n_catalog.i18nc("@info:progress", "Initializing Active Machine..."))
         super().setGlobalContainerStack(stack)
 
@@ -812,6 +813,7 @@ class CuraApplication(QtApplication):
         self._output_device_manager.start()
         self._welcome_pages_model.initialize()
         self._add_printer_pages_model.initialize()
+        self._add_printer_pages_model_without_cancel.initialize(cancellable = False)
         self._whats_new_pages_model.initialize()
 
         # Detect in which mode to run and execute that mode
@@ -849,6 +851,7 @@ class CuraApplication(QtApplication):
             self.callLater(self._openFile, file_name)
 
     initializationFinished = pyqtSignal()
+    showAddPrintersUncancellableDialog = pyqtSignal()  # Used to show the add printers dialog with a greyed background
 
     def runWithoutGUI(self):
         """Run Cura without GUI elements and interaction (server mode)."""
@@ -939,6 +942,10 @@ class CuraApplication(QtApplication):
     def getAddPrinterPagesModel(self, *args) -> "AddPrinterPagesModel":
         return self._add_printer_pages_model
 
+    @pyqtSlot(result = QObject)
+    def getAddPrinterPagesModelWithoutCancel(self, *args) -> "AddPrinterPagesModel":
+        return self._add_printer_pages_model_without_cancel
+
     @pyqtSlot(result = QObject)
     def getWhatsNewPagesModel(self, *args) -> "WhatsNewPagesModel":
         return self._whats_new_pages_model
diff --git a/cura/Machines/Models/BaseMaterialsModel.py b/cura/Machines/Models/BaseMaterialsModel.py
index aa8552bebb..776d540867 100644
--- a/cura/Machines/Models/BaseMaterialsModel.py
+++ b/cura/Machines/Models/BaseMaterialsModel.py
@@ -154,7 +154,7 @@ class BaseMaterialsModel(ListModel):
 
         # Update the available materials (ContainerNode) for the current active machine and extruder setup.
         global_stack = cura.CuraApplication.CuraApplication.getInstance().getGlobalContainerStack()
-        if not global_stack.hasMaterials:
+        if not global_stack or not global_stack.hasMaterials:
             return  # There are no materials for this machine, so nothing to do.
         extruder_list = global_stack.extruderList
         if self._extruder_position > len(extruder_list):
diff --git a/cura/Settings/MachineManager.py b/cura/Settings/MachineManager.py
index 523572dae0..423df167cd 100755
--- a/cura/Settings/MachineManager.py
+++ b/cura/Settings/MachineManager.py
@@ -290,9 +290,15 @@ class MachineManager(QObject):
             self.activeStackValueChanged.emit()
 
     @pyqtSlot(str)
-    def setActiveMachine(self, stack_id: str) -> None:
+    def setActiveMachine(self, stack_id: Optional[str]) -> None:
         self.blurSettings.emit()  # Ensure no-one has focus.
 
+        if not stack_id:
+            self._application.setGlobalContainerStack(None)
+            self.globalContainerChanged.emit()
+            self._application.showAddPrintersUncancellableDialog.emit()
+            return
+
         container_registry = CuraContainerRegistry.getInstance()
         containers = container_registry.findContainerStacks(id = stack_id)
         if not containers:
@@ -721,6 +727,8 @@ class MachineManager(QObject):
             other_machine_stacks = [s for s in machine_stacks if s["id"] != machine_id]
             if other_machine_stacks:
                 self.setActiveMachine(other_machine_stacks[0]["id"])
+            else:
+                self.setActiveMachine(None)
 
         metadatas = CuraContainerRegistry.getInstance().findContainerStacksMetadata(id = machine_id)
         if not metadatas:
diff --git a/cura/UI/AddPrinterPagesModel.py b/cura/UI/AddPrinterPagesModel.py
index b06f220374..9b35dbcacc 100644
--- a/cura/UI/AddPrinterPagesModel.py
+++ b/cura/UI/AddPrinterPagesModel.py
@@ -10,12 +10,11 @@ from .WelcomePagesModel import WelcomePagesModel
 #
 class AddPrinterPagesModel(WelcomePagesModel):
 
-    def initialize(self) -> None:
+    def initialize(self, cancellable: bool = True) -> None:
         self._pages.append({"id": "add_network_or_local_printer",
                             "page_url": self._getBuiltinWelcomePagePath("AddNetworkOrLocalPrinterContent.qml"),
                             "next_page_id": "machine_actions",
                             "next_page_button_text": self._catalog.i18nc("@action:button", "Add"),
-                            "previous_page_button_text": self._catalog.i18nc("@action:button", "Cancel"),
                             })
         self._pages.append({"id": "add_printer_by_ip",
                             "page_url": self._getBuiltinWelcomePagePath("AddPrinterByIpContent.qml"),
@@ -30,6 +29,9 @@ class AddPrinterPagesModel(WelcomePagesModel):
                             "page_url": self._getBuiltinWelcomePagePath("FirstStartMachineActionsContent.qml"),
                             "should_show_function": self.shouldShowMachineActions,
                             })
+        if cancellable:
+            self._pages[0]["previous_page_button_text"] = self._catalog.i18nc("@action:button", "Cancel")
+
         self.setItems(self._pages)
 
 
diff --git a/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDeviceManager.py b/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDeviceManager.py
index 9f93d0fe54..33c9caba05 100644
--- a/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDeviceManager.py
+++ b/plugins/UM3NetworkPrinting/src/Cloud/CloudOutputDeviceManager.py
@@ -4,6 +4,7 @@ import os
 from typing import Dict, List, Optional, Set
 
 from PyQt5.QtNetwork import QNetworkReply
+from PyQt5.QtWidgets import QMessageBox
 
 from UM import i18nCatalog
 from UM.Logger import Logger  # To log errors talking to the API.
@@ -50,6 +51,7 @@ class CloudOutputDeviceManager:
         self._account = CuraApplication.getInstance().getCuraAPI().account  # type: Account
         self._api = CloudApiClient(CuraApplication.getInstance(), on_error = lambda error: Logger.log("e", str(error)))
         self._account.loginStateChanged.connect(self._onLoginStateChanged)
+        self._removed_printers_message = None  # type: Optional[Message]
 
         # Ensure we don't start twice.
         self._running = False
@@ -120,6 +122,11 @@ class CloudOutputDeviceManager:
                 self._um_cloud_printers[device_id].setMetaDataEntry(META_UM_LINKED_TO_ACCOUNT, True)
         self._onDevicesDiscovered(new_clusters)
 
+        # Hide the current removed_printers_message, if there is any
+        if self._removed_printers_message:
+            self._removed_printers_message.actionTriggered.disconnect(self._onRemovedPrintersMessageActionTriggered)
+            self._removed_printers_message.hide()
+
         # Remove the CloudOutput device for offline printers
         offline_device_keys = set(self._remote_clusters.keys()) - set(online_clusters.keys())
         for device_id in offline_device_keys:
@@ -269,14 +276,13 @@ class CloudOutputDeviceManager:
             return
 
         # Generate message
-        removed_printers_message = Message(
+        self._removed_printers_message = Message(
                 title = self.I18N_CATALOG.i18ncp(
                         "info:status",
                         "Cloud connection is not available for a printer",
                         "Cloud connection is not available for some printers",
                         len(self.reported_device_ids)
-                ),
-                lifetime = 0
+                )
         )
         device_names = "\n".join(["<li>{} ({})</li>".format(self._um_cloud_printers[device].name, self._um_cloud_printers[device].definition.name) for device in self.reported_device_ids])
         message_text = self.I18N_CATALOG.i18ncp(
@@ -291,13 +297,19 @@ class CloudOutputDeviceManager:
                 "<a href='https://mycloud.ultimaker.com/'>Ultimaker Digital Factory</a>.",
                 device_names
         )
-        removed_printers_message.setText(message_text)
-        removed_printers_message.addAction("keep_printer_configurations_action",
-                               name = self.I18N_CATALOG.i18nc("@action:button", "Keep printer configurations"),
-                               icon = "",
-                               description = "Keep the configuration of the cloud printer(s) synced with Cura which are not linked to your account.",
-                               button_align = Message.ActionButtonAlignment.ALIGN_RIGHT)
-        removed_printers_message.actionTriggered.connect(self._onRemovedPrintersMessageActionTriggered)
+        self._removed_printers_message.setText(message_text)
+        self._removed_printers_message.addAction("keep_printer_configurations_action",
+                                                 name = self.I18N_CATALOG.i18nc("@action:button", "Keep printer configurations"),
+                                                 icon = "",
+                                                 description = "Keep the configuration of the cloud printer(s) synced with Cura which are not linked to your account.",
+                                                 button_align = Message.ActionButtonAlignment.ALIGN_RIGHT)
+        self._removed_printers_message.addAction("remove_printers_action",
+                                                 name = self.I18N_CATALOG.i18nc("@action:button", "Remove printers"),
+                                                 icon = "",
+                                                 description = "Remove the cloud printer(s) which are not linked to your account.",
+                                                 button_style = Message.ActionButtonStyle.SECONDARY,
+                                                 button_align = Message.ActionButtonAlignment.ALIGN_LEFT)
+        self._removed_printers_message.actionTriggered.connect(self._onRemovedPrintersMessageActionTriggered)
 
         output_device_manager = CuraApplication.getInstance().getOutputDeviceManager()
 
@@ -314,7 +326,7 @@ class CloudOutputDeviceManager:
             # Update the printer's metadata to mark it as not linked to the account
             device.setMetaDataEntry(META_UM_LINKED_TO_ACCOUNT, False)
 
-        removed_printers_message.show()
+        self._removed_printers_message.show()
 
     def _onDiscoveredDeviceRemoved(self, device_id: str) -> None:
         device = self._remote_clusters.pop(device_id, None)  # type: Optional[CloudOutputDevice]
@@ -402,7 +414,23 @@ class CloudOutputDeviceManager:
             if container_cluster_id in self._remote_clusters.keys():
                 del self._remote_clusters[container_cluster_id]
 
-    @staticmethod
-    def _onRemovedPrintersMessageActionTriggered(removed_printers_message: Message, action: str) -> None:
+    def _onRemovedPrintersMessageActionTriggered(self, removed_printers_message: Message, action: str) -> None:
         if action == "keep_printer_configurations_action":
             removed_printers_message.hide()
+        elif action == "remove_printers_action":
+            machine_manager = CuraApplication.getInstance().getMachineManager()
+            remove_printers_ids = {self._um_cloud_printers[i].getId() for i in self.reported_device_ids}
+            all_ids = {m.getId() for m in CuraApplication.getInstance().getContainerRegistry().findContainerStacks(type = "machine")}
+
+            question_title = self.I18N_CATALOG.i18nc("@title:window", "Remove printers?")
+            question_content = self.I18N_CATALOG.i18nc("@label", "You are about to remove {} printer(s) from Cura. This action cannot be undone. \nAre you sure you want to continue?".format(len(remove_printers_ids)))
+            if remove_printers_ids == all_ids:
+                question_content = self.I18N_CATALOG.i18nc("@label", "You are about to remove all printers from Cura. This action cannot be undone. \nAre you sure you want to continue?")
+            result = QMessageBox.question(None, question_title, question_content)
+            if result == QMessageBox.No:
+                return
+
+            for machine_cloud_id in self.reported_device_ids:
+                machine_manager.setActiveMachine(self._um_cloud_printers[machine_cloud_id].getId())
+                machine_manager.removeMachine(self._um_cloud_printers[machine_cloud_id].getId())
+            removed_printers_message.hide()
diff --git a/resources/qml/Cura.qml b/resources/qml/Cura.qml
index ed2c6dc5fe..8ba651a5b0 100644
--- a/resources/qml/Cura.qml
+++ b/resources/qml/Cura.qml
@@ -84,6 +84,21 @@ UM.MainWindow
         CuraApplication.purgeWindows()
     }
 
+    Connections
+    {
+        // This connection is used when there is no ActiveMachine and the user is logged in
+        target: CuraApplication
+        onShowAddPrintersUncancellableDialog:
+        {
+            Cura.Actions.parent = backgroundItem
+
+            // Reuse the welcome dialog item to show "Add a printer" only.
+            welcomeDialogItem.model = CuraApplication.getAddPrinterPagesModelWithoutCancel()
+            welcomeDialogItem.progressBarVisible = false
+            welcomeDialogItem.visible = true
+        }
+    }
+
     Connections
     {
         target: CuraApplication
@@ -117,6 +132,15 @@ UM.MainWindow
                 welcomeDialogItem.progressBarVisible = false
                 welcomeDialogItem.visible = true
             }
+
+            // Reuse the welcome dialog item to show the "Add printers" dialog. Triggered when there is no active
+            // machine and the user is logged in.
+            if (!Cura.MachineManager.activeMachine && Cura.API.account.isLoggedIn)
+            {
+                welcomeDialogItem.model = CuraApplication.getAddPrinterPagesModelWithoutCancel()
+                welcomeDialogItem.progressBarVisible = false
+                welcomeDialogItem.visible = true
+            }
         }
     }
 
diff --git a/resources/qml/Dialogs/WorkspaceSummaryDialog.qml b/resources/qml/Dialogs/WorkspaceSummaryDialog.qml
index 6fe9607274..670766204f 100644
--- a/resources/qml/Dialogs/WorkspaceSummaryDialog.qml
+++ b/resources/qml/Dialogs/WorkspaceSummaryDialog.qml
@@ -143,7 +143,7 @@ UM.Dialog
                 {
                     width: parent.width
                     height: childrenRect.height
-                    model: Cura.MachineManager.activeMachine.extruderList
+                    model: Cura.MachineManager.activeMachine ? Cura.MachineManager.activeMachine.extruderList : null
                     delegate: Column
                     {
                         height: childrenRect.height
diff --git a/resources/qml/Menus/ConfigurationMenu/ConfigurationMenu.qml b/resources/qml/Menus/ConfigurationMenu/ConfigurationMenu.qml
index 5d8414846b..cb498bcef0 100644
--- a/resources/qml/Menus/ConfigurationMenu/ConfigurationMenu.qml
+++ b/resources/qml/Menus/ConfigurationMenu/ConfigurationMenu.qml
@@ -33,7 +33,7 @@ Cura.ExpandablePopup
     }
 
     contentPadding: UM.Theme.getSize("default_lining").width
-    enabled: Cura.MachineManager.activeMachine.hasMaterials || Cura.MachineManager.activeMachine.hasVariants || Cura.MachineManager.activeMachine.hasVariantBuildplates; //Only let it drop down if there is any configuration that you could change.
+    enabled: Cura.MachineManager.activeMachine ? Cura.MachineManager.activeMachine.hasMaterials || Cura.MachineManager.activeMachine.hasVariants || Cura.MachineManager.activeMachine.hasVariantBuildplates : false; //Only let it drop down if there is any configuration that you could change.
 
     headerItem: Item
     {
@@ -84,7 +84,7 @@ Cura.ExpandablePopup
                     {
                         id: variantLabel
 
-                        visible: Cura.MachineManager.activeMachine.hasVariants
+                        visible: Cura.MachineManager.activeMachine ? Cura.MachineManager.activeMachine.hasVariants : false
 
                         text: model.variant
                         elide: Text.ElideRight
@@ -114,7 +114,7 @@ Cura.ExpandablePopup
             color: UM.Theme.getColor("text")
             renderType: Text.NativeRendering
 
-            visible: !Cura.MachineManager.activeMachine.hasMaterials && (Cura.MachineManager.activeMachine.hasVariants || Cura.MachineManager.activeMachine.hasVariantBuildplates)
+            visible: Cura.MachineManager.activeMachine ? !Cura.MachineManager.activeMachine.hasMaterials && (Cura.MachineManager.activeMachine.hasVariants || Cura.MachineManager.activeMachine.hasVariantBuildplates) : false
 
             anchors
             {
diff --git a/resources/qml/Menus/ConfigurationMenu/CustomConfiguration.qml b/resources/qml/Menus/ConfigurationMenu/CustomConfiguration.qml
index 65f5bcce8c..010e2e77b0 100644
--- a/resources/qml/Menus/ConfigurationMenu/CustomConfiguration.qml
+++ b/resources/qml/Menus/ConfigurationMenu/CustomConfiguration.qml
@@ -244,7 +244,7 @@ Item
             Row
             {
                 height: visible ? UM.Theme.getSize("print_setup_big_item").height : 0
-                visible: Cura.MachineManager.activeMachine.hasMaterials
+                visible: Cura.MachineManager.activeMachine ? Cura.MachineManager.activeMachine.hasMaterials : false
 
                 Label
                 {
@@ -305,7 +305,7 @@ Item
             Row
             {
                 height: visible ? UM.Theme.getSize("print_setup_big_item").height : 0
-                visible: Cura.MachineManager.activeMachine.hasVariants
+                visible: Cura.MachineManager.activeMachine ? Cura.MachineManager.activeMachine.hasVariants : false
 
                 Label
                 {
diff --git a/resources/qml/PrintSetupSelector/Recommended/RecommendedSupportSelector.qml b/resources/qml/PrintSetupSelector/Recommended/RecommendedSupportSelector.qml
index f227dddaf9..92f0024b23 100644
--- a/resources/qml/PrintSetupSelector/Recommended/RecommendedSupportSelector.qml
+++ b/resources/qml/PrintSetupSelector/Recommended/RecommendedSupportSelector.qml
@@ -130,7 +130,11 @@ Item
                 target: extruderModel
                 onModelChanged:
                 {
-                    supportExtruderCombobox.color = supportExtruderCombobox.model.getItem(supportExtruderCombobox.currentIndex).color
+                    var maybeColor = supportExtruderCombobox.model.getItem(supportExtruderCombobox.currentIndex).color
+                    if (maybeColor)
+                    {
+                        supportExtruderCombobox.color = maybeColor
+                    }
                 }
             }
             onCurrentIndexChanged:
diff --git a/resources/qml/PrinterSelector/MachineSelectorList.qml b/resources/qml/PrinterSelector/MachineSelectorList.qml
index a7c041630f..18b1a68b20 100644
--- a/resources/qml/PrinterSelector/MachineSelectorList.qml
+++ b/resources/qml/PrinterSelector/MachineSelectorList.qml
@@ -28,11 +28,11 @@ ListView
 
     delegate: MachineSelectorButton
     {
-        text: model.name
+        text: model.name ? model.name : ""
         width: listView.width
         outputDevice: Cura.MachineManager.printerOutputDevices.length >= 1 ? Cura.MachineManager.printerOutputDevices[0] : null
 
-        checked: Cura.MachineManager.activeMachine.id == model.id
+        checked: Cura.MachineManager.activeMachine ? Cura.MachineManager.activeMachine.id == model.id : false
 
         onClicked:
         {