diff --git a/cura/UI/MachineModels/DiscoveredPrintersModel.py b/cura/UI/MachineModels/DiscoveredPrintersModel.py
index 15d002298c..e127ba48af 100644
--- a/cura/UI/MachineModels/DiscoveredPrintersModel.py
+++ b/cura/UI/MachineModels/DiscoveredPrintersModel.py
@@ -88,7 +88,7 @@ class DiscoveredPrintersModel(QObject):
     discoveredPrintersChanged = pyqtSignal()
 
     @pyqtProperty(list, notify = discoveredPrintersChanged)
-    def discovered_printers(self) -> "List[DiscoveredPrinter]":
+    def discovered_printers(self) -> List["DiscoveredPrinter"]:
         item_list = list(x for x in self._discovered_printer_by_ip_dict.values())
         item_list.sort(key = lambda x: x.name)
         return item_list
@@ -125,6 +125,8 @@ class DiscoveredPrintersModel(QObject):
         del self._discovered_printer_by_ip_dict[ip_address]
         self.discoveredPrintersChanged.emit()
 
+    # A convenience function for QML to create a machine (GlobalStack) out of the given discovered printer.
+    # This function invokes the given discovered printer's "create_callback" to do this.
     @pyqtSlot("QVariant")
     def createMachineFromDiscoveredPrinter(self, discovered_printer: "DiscoveredPrinter") -> None:
         discovered_printer.create_callback(discovered_printer.getKey())
diff --git a/plugins/UM3NetworkPrinting/src/UM3OutputDevicePlugin.py b/plugins/UM3NetworkPrinting/src/UM3OutputDevicePlugin.py
index 3217e3be9d..60ffe477bc 100644
--- a/plugins/UM3NetworkPrinting/src/UM3OutputDevicePlugin.py
+++ b/plugins/UM3NetworkPrinting/src/UM3OutputDevicePlugin.py
@@ -1,24 +1,25 @@
 # Copyright (c) 2019 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
 import json
+import os
 from queue import Queue
 from threading import Event, Thread
 from time import time
-import os
-from typing import Optional, TYPE_CHECKING
+from typing import Optional, TYPE_CHECKING, Dict
 
 from zeroconf import Zeroconf, ServiceBrowser, ServiceStateChange, ServiceInfo
+
 from PyQt5.QtNetwork import QNetworkRequest, QNetworkAccessManager
 from PyQt5.QtCore import QUrl
 from PyQt5.QtGui import QDesktopServices
 
 from cura.CuraApplication import CuraApplication
 from cura.PrinterOutput.PrinterOutputDevice import ConnectionType
-from UM.OutputDevice.OutputDeviceManager import ManualDeviceAdditionAttempt
 
 from UM.i18n import i18nCatalog
 from UM.Logger import Logger
 from UM.Message import Message
+from UM.OutputDevice.OutputDeviceManager import ManualDeviceAdditionAttempt
 from UM.OutputDevice.OutputDevicePlugin import OutputDevicePlugin
 from UM.PluginRegistry import PluginRegistry
 from UM.Signal import Signal, signalemitter
@@ -28,6 +29,7 @@ from . import ClusterUM3OutputDevice, LegacyUM3OutputDevice
 from .Cloud.CloudOutputDeviceManager import CloudOutputDeviceManager
 
 if TYPE_CHECKING:
+    from PyQt5.QtNetwork import QNetworkReply
     from cura.Settings.GlobalStack import GlobalStack
     from UM.OutputDevice.OutputDevicePlugin import OutputDevicePlugin
 
@@ -254,7 +256,7 @@ class UM3OutputDevicePlugin(OutputDevicePlugin):
         name_request = QNetworkRequest(url)
         self._network_manager.get(name_request)
 
-    def _onNetworkRequestFinished(self, reply):
+    def _onNetworkRequestFinished(self, reply: "QNetworkReply") -> None:
         reply_url = reply.url().toString()
 
         address = ""
@@ -324,7 +326,7 @@ class UM3OutputDevicePlugin(OutputDevicePlugin):
             self.getOutputDeviceManager().addOutputDevice(device)
             self.addManualDeviceSignal.emit(self.getPluginId(), device.getId(), address, properties)
 
-    def _onRemoveDevice(self, device_id):
+    def _onRemoveDevice(self, device_id: str) -> None:
         device = self._discovered_devices.pop(device_id, None)
         if device:
             if device.isConnected():
diff --git a/resources/qml/WelcomePages/AddLocalPrinterScrollView.qml b/resources/qml/WelcomePages/AddLocalPrinterScrollView.qml
index 7ad0f5c96c..f8db8b297e 100644
--- a/resources/qml/WelcomePages/AddLocalPrinterScrollView.qml
+++ b/resources/qml/WelcomePages/AddLocalPrinterScrollView.qml
@@ -16,10 +16,13 @@ ScrollView
 {
     id: base
 
+    // The currently selected machine item in the local machine list.
     property var currentItem: (machineList.currentIndex >= 0)
                               ? machineList.model.getItem(machineList.currentIndex)
                               : null
+    // The currently active (expanded) section/category, where section/category is the grouping of local machine items.
     property string currentSection: preferredCategory
+    // By default (when this list shows up) we always expand the "Ultimaker" section.
     property string preferredCategory: "Ultimaker"
 
     ScrollBar.horizontal.policy: ScrollBar.AlwaysOff
diff --git a/resources/qml/WelcomePages/AddNetworkPrinterScrollView.qml b/resources/qml/WelcomePages/AddNetworkPrinterScrollView.qml
index b27e4db1fe..575ec9c126 100644
--- a/resources/qml/WelcomePages/AddNetworkPrinterScrollView.qml
+++ b/resources/qml/WelcomePages/AddNetworkPrinterScrollView.qml
@@ -91,7 +91,7 @@ Item
 
                     anchors.left: parent.left
                     anchors.right: parent.right
-                    anchors.rightMargin: 10
+                    anchors.rightMargin: UM.Theme.getSize("default_margin").width
                     outputDevice: modelData.device
 
                     enabled: !modelData.is_unknown_machine_type