diff --git a/plugins/3MFReader/ThreeMFReader.py b/plugins/3MFReader/ThreeMFReader.py
index 450cafdeda..6bfe920863 100755
--- a/plugins/3MFReader/ThreeMFReader.py
+++ b/plugins/3MFReader/ThreeMFReader.py
@@ -38,8 +38,8 @@ except ImportError:
 
 ##    Base implementation for reading 3MF files. Has no support for textures. Only loads meshes!
 class ThreeMFReader(MeshReader):
-    def __init__(self, application):
-        super().__init__(application)
+    def __init__(self) -> None:
+        super().__init__()
 
         MimeTypeDatabase.addMimeType(
             MimeType(
diff --git a/plugins/3MFReader/__init__.py b/plugins/3MFReader/__init__.py
index feabf19818..3a4fde4ab8 100644
--- a/plugins/3MFReader/__init__.py
+++ b/plugins/3MFReader/__init__.py
@@ -18,7 +18,7 @@ catalog = i18nCatalog("cura")
 
 
 def getMetaData() -> Dict:
-    # Workarround for osx not supporting double file extensions correctly.
+    # Workaround for osx not supporting double file extensions correctly.
     if Platform.isOSX():
         workspace_extension = "3mf"
     else:
@@ -44,7 +44,7 @@ def getMetaData() -> Dict:
 
 def register(app):
     if "3MFReader.ThreeMFReader" in sys.modules:
-        return {"mesh_reader": ThreeMFReader.ThreeMFReader(app),
+        return {"mesh_reader": ThreeMFReader.ThreeMFReader(),
                 "workspace_reader": ThreeMFWorkspaceReader.ThreeMFWorkspaceReader()}
     else:
         return {}
diff --git a/plugins/GCodeGzReader/GCodeGzReader.py b/plugins/GCodeGzReader/GCodeGzReader.py
index 7a6a76d4a5..73a08075d2 100644
--- a/plugins/GCodeGzReader/GCodeGzReader.py
+++ b/plugins/GCodeGzReader/GCodeGzReader.py
@@ -11,9 +11,8 @@ from UM.PluginRegistry import PluginRegistry
 #
 #   If you're zipping g-code, you might as well use gzip!
 class GCodeGzReader(MeshReader):
-
-    def __init__(self, application):
-        super().__init__(application)
+    def __init__(self) -> None:
+        super().__init__()
         self._supported_extensions = [".gcode.gz"]
 
     def _read(self, file_name):
diff --git a/plugins/GCodeGzReader/__init__.py b/plugins/GCodeGzReader/__init__.py
index e6bae6615e..3d7ae85d30 100644
--- a/plugins/GCodeGzReader/__init__.py
+++ b/plugins/GCodeGzReader/__init__.py
@@ -19,6 +19,7 @@ def getMetaData():
         ]
     }
 
+
 def register(app):
     app.addNonSliceableExtension(".gz")
-    return { "mesh_reader": GCodeGzReader.GCodeGzReader(app) }
+    return {"mesh_reader": GCodeGzReader.GCodeGzReader()}
diff --git a/plugins/GCodeReader/GCodeReader.py b/plugins/GCodeReader/GCodeReader.py
index c51fc9c8a7..45ef1e1058 100755
--- a/plugins/GCodeReader/GCodeReader.py
+++ b/plugins/GCodeReader/GCodeReader.py
@@ -19,16 +19,16 @@ MimeTypeDatabase.addMimeType(
     )
 )
 
+
 # Class for loading and parsing G-code files
 class GCodeReader(MeshReader):
-
     _flavor_default = "Marlin"
     _flavor_keyword = ";FLAVOR:"
     _flavor_readers_dict = {"RepRap" : RepRapFlavorParser.RepRapFlavorParser(),
                             "Marlin" : MarlinFlavorParser.MarlinFlavorParser()}
 
-    def __init__(self, application):
-        super(GCodeReader, self).__init__(application)
+    def __init__(self) -> None:
+        super().__init__()
         self._supported_extensions = [".gcode", ".g"]
         self._flavor_reader = None
 
diff --git a/plugins/GCodeReader/__init__.py b/plugins/GCodeReader/__init__.py
index 399de8a90e..4158a038b0 100644
--- a/plugins/GCodeReader/__init__.py
+++ b/plugins/GCodeReader/__init__.py
@@ -20,7 +20,8 @@ def getMetaData():
         ]
     }
 
+
 def register(app):
     app.addNonSliceableExtension(".gcode")
     app.addNonSliceableExtension(".g")
-    return { "mesh_reader": GCodeReader.GCodeReader(app) }
+    return {"mesh_reader": GCodeReader.GCodeReader()}
diff --git a/plugins/ImageReader/ImageReader.py b/plugins/ImageReader/ImageReader.py
index 89f163cfca..5195b61595 100644
--- a/plugins/ImageReader/ImageReader.py
+++ b/plugins/ImageReader/ImageReader.py
@@ -17,8 +17,8 @@ from cura.Scene.CuraSceneNode import CuraSceneNode as SceneNode
 
 
 class ImageReader(MeshReader):
-    def __init__(self, application):
-        super(ImageReader, self).__init__(application)
+    def __init__(self) -> None:
+        super().__init__()
         self._supported_extensions = [".jpg", ".jpeg", ".bmp", ".gif", ".png"]
         self._ui = ImageReaderUI(self)
 
diff --git a/plugins/ImageReader/__init__.py b/plugins/ImageReader/__init__.py
index f30fdb83b0..67ad106646 100644
--- a/plugins/ImageReader/__init__.py
+++ b/plugins/ImageReader/__init__.py
@@ -32,5 +32,6 @@ def getMetaData():
         ]
     }
 
+
 def register(app):
-    return { "mesh_reader": ImageReader.ImageReader(app) }
+    return {"mesh_reader": ImageReader.ImageReader()}
diff --git a/plugins/X3DReader/X3DReader.py b/plugins/X3DReader/X3DReader.py
index e57ec524db..44a2f1443a 100644
--- a/plugins/X3DReader/X3DReader.py
+++ b/plugins/X3DReader/X3DReader.py
@@ -26,8 +26,8 @@ except ImportError:
 DEFAULT_SUBDIV = 16 # Default subdivision factor for spheres, cones, and cylinders
 EPSILON = 0.000001
 
-class Shape:
 
+class Shape:
     # Expects verts in MeshBuilder-ready format, as a n by 3 mdarray
     # with vertices stored in rows
     def __init__(self, verts, faces, index_base, name):
@@ -37,9 +37,10 @@ class Shape:
         self.index_base = index_base
         self.name = name
 
+
 class X3DReader(MeshReader):
-    def __init__(self, application):
-        super().__init__(application)
+    def __init__(self) -> None:
+        super().__init__()
         self._supported_extensions = [".x3d"]
         self._namespaces = {}
 
diff --git a/plugins/X3DReader/__init__.py b/plugins/X3DReader/__init__.py
index 03ed4ae301..624611ff02 100644
--- a/plugins/X3DReader/__init__.py
+++ b/plugins/X3DReader/__init__.py
@@ -15,5 +15,6 @@ def getMetaData():
         ]
     }
 
+
 def register(app):
-    return { "mesh_reader": X3DReader.X3DReader(app) }
+    return {"mesh_reader": X3DReader.X3DReader()}