diff --git a/plugins/USBPrinting/USBPrinterOutputDevice.py b/plugins/USBPrinting/USBPrinterOutputDevice.py
index c9758d88d4..adb3b03700 100644
--- a/plugins/USBPrinting/USBPrinterOutputDevice.py
+++ b/plugins/USBPrinting/USBPrinterOutputDevice.py
@@ -88,7 +88,8 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
         self._firmware_name_requested = False
         self._firmware_updater = AvrFirmwareUpdater(self)
 
-        self._monitor_view_qml_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "MonitorItem.qml")
+        plugin_path = cast(str, PluginRegistry.getInstance().getPluginPath("USBPrinting"))
+        self._monitor_view_qml_path = os.path.join(plugin_path, "MonitorItem.qml")
 
         CuraApplication.getInstance().getOnExitCallbackManager().addCallback(self._checkActivePrintingUponAppExit)
 
diff --git a/plugins/XmlMaterialProfile/PluginInfo.py b/plugins/XmlMaterialProfile/PluginInfo.py
new file mode 100644
index 0000000000..4b78a47a5e
--- /dev/null
+++ b/plugins/XmlMaterialProfile/PluginInfo.py
@@ -0,0 +1,15 @@
+from UM.PluginObject import PluginObject
+
+
+class PluginInfo(PluginObject):
+    __instance = None # type: PluginInfo
+
+    def __init__(self, *args, **kwags):
+        super().__init__(*args, **kwags)
+        if PluginInfo.__instance is not None:
+            raise RuntimeError("Try to create singleton '%s' more than once" % self.__class__.__name__)
+        PluginInfo.__instance = self
+
+    @classmethod
+    def getInstance(cls, *args, **kwargs) -> "PluginInfo":
+        return cls.__instance
\ No newline at end of file
diff --git a/plugins/XmlMaterialProfile/XmlMaterialProfile.py b/plugins/XmlMaterialProfile/XmlMaterialProfile.py
index bf1bf19e32..30bbecc86e 100644
--- a/plugins/XmlMaterialProfile/XmlMaterialProfile.py
+++ b/plugins/XmlMaterialProfile/XmlMaterialProfile.py
@@ -9,6 +9,7 @@ import sys
 from typing import Any, Dict, List, Optional, Tuple, cast, Set, Union
 import xml.etree.ElementTree as ET
 
+from UM.PluginRegistry import PluginRegistry
 from UM.Resources import Resources
 from UM.Logger import Logger
 import UM.Dictionary
@@ -1068,7 +1069,8 @@ class XmlMaterialProfile(InstanceContainer):
     #   This loads the mapping from a file.
     @classmethod
     def getProductIdMap(cls) -> Dict[str, List[str]]:
-        product_to_id_file = os.path.join(os.path.dirname(sys.modules[cls.__module__].__file__), "product_to_id.json")
+        plugin_path = cast(str, PluginRegistry.getInstance().getPluginPath("XmlMaterialProfile"))
+        product_to_id_file = os.path.join(plugin_path, "product_to_id.json")
         with open(product_to_id_file, encoding = "utf-8") as f:
             product_to_id_map = json.load(f)
         product_to_id_map = {key: [value] for key, value in product_to_id_map.items()}