diff --git a/plugins/UM3NetworkPrinting/plugin.json b/plugins/UM3NetworkPrinting/plugin.json
index 894fc41815..039b412643 100644
--- a/plugins/UM3NetworkPrinting/plugin.json
+++ b/plugins/UM3NetworkPrinting/plugin.json
@@ -2,7 +2,7 @@
     "name": "Ultimaker Network Connection",
     "author": "Ultimaker B.V.",
     "description": "Manages network connections to Ultimaker networked printers.",
-    "version": "1.0.1",
+    "version": "2.0.0",
     "api": "6.0",
     "i18n-catalog": "cura"
 }
diff --git a/plugins/UM3NetworkPrinting/src/Messages/MaterialSyncMessage.py b/plugins/UM3NetworkPrinting/src/Messages/MaterialSyncMessage.py
new file mode 100644
index 0000000000..e021b2ae99
--- /dev/null
+++ b/plugins/UM3NetworkPrinting/src/Messages/MaterialSyncMessage.py
@@ -0,0 +1,39 @@
+# Copyright (c) 2019 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+from typing import TYPE_CHECKING
+
+from UM import i18nCatalog
+from UM.Message import Message
+
+
+if TYPE_CHECKING:
+    from ..UltimakerNetworkedPrinterOutputDevice import UltimakerNetworkedPrinterOutputDevice
+
+
+I18N_CATALOG = i18nCatalog("cura")
+
+
+## Message shown when sending material files to cluster host.
+class MaterialSyncMessage(Message):
+
+    # Singleton used to prevent duplicate messages of this type at the same time.
+    __is_visible = False
+
+    def __init__(self, device: "UltimakerNetworkedPrinterOutputDevice") -> None:
+        super().__init__(
+            text = I18N_CATALOG.i18nc("@info:status", "Cura has detected material profiles that were not yet installed "
+                                                      "on the host printer of group {0}.", device.name),
+            title = I18N_CATALOG.i18nc("@info:title", "Sending materials to printer"),
+            lifetime = 10,
+            dismissable = True
+        )
+
+    def show(self) -> None:
+        if MaterialSyncMessage.__is_visible:
+            return
+        super().show()
+        MaterialSyncMessage.__is_visible = True
+
+    def hide(self, send_signal = True) -> None:
+        super().hide(send_signal)
+        MaterialSyncMessage.__is_visible = False
diff --git a/plugins/UM3NetworkPrinting/src/Models/ClusterMaterial.py b/plugins/UM3NetworkPrinting/src/Models/Http/ClusterMaterial.py
similarity index 94%
rename from plugins/UM3NetworkPrinting/src/Models/ClusterMaterial.py
rename to plugins/UM3NetworkPrinting/src/Models/Http/ClusterMaterial.py
index a441f28292..afc0851211 100644
--- a/plugins/UM3NetworkPrinting/src/Models/ClusterMaterial.py
+++ b/plugins/UM3NetworkPrinting/src/Models/Http/ClusterMaterial.py
@@ -1,6 +1,6 @@
 # Copyright (c) 2019 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
-from .BaseModel import BaseModel
+from ..BaseModel import BaseModel
 
 
 class ClusterMaterial(BaseModel):
diff --git a/plugins/UM3NetworkPrinting/src/Models/Http/ClusterPrinterMaterialStation.py b/plugins/UM3NetworkPrinting/src/Models/Http/ClusterPrinterMaterialStation.py
index 295044b957..c51e07bcfc 100644
--- a/plugins/UM3NetworkPrinting/src/Models/Http/ClusterPrinterMaterialStation.py
+++ b/plugins/UM3NetworkPrinting/src/Models/Http/ClusterPrinterMaterialStation.py
@@ -8,13 +8,13 @@ from .ClusterPrinterMaterialStationSlot import ClusterPrinterMaterialStationSlot
 
 ## Class representing the data of a Material Station in the cluster.
 class ClusterPrinterMaterialStation(BaseModel):
-    
+
     ## Creates a new Material Station status.
     #  \param status: The status of the material station.
     #  \param: supported: Whether the material station is supported on this machine or not.
     #  \param material_slots: The active slots configurations of this material station.
     def __init__(self, status: str, supported: bool = False,
-                 material_slots: Union[None, Dict[str, Any], ClusterPrinterMaterialStationSlot] = None,
+                 material_slots: List[Union[ClusterPrinterMaterialStationSlot, Dict[str, Any]]] = None,
                  **kwargs) -> None:
         self.status = status
         self.supported = supported
diff --git a/plugins/UM3NetworkPrinting/src/Models/Http/ClusterPrinterStatus.py b/plugins/UM3NetworkPrinting/src/Models/Http/ClusterPrinterStatus.py
index 841cfd9fa1..986f9d5cfa 100644
--- a/plugins/UM3NetworkPrinting/src/Models/Http/ClusterPrinterStatus.py
+++ b/plugins/UM3NetworkPrinting/src/Models/Http/ClusterPrinterStatus.py
@@ -13,6 +13,7 @@ from .ClusterBuildPlate import ClusterBuildPlate
 from .ClusterPrintCoreConfiguration import ClusterPrintCoreConfiguration
 from .ClusterPrinterMaterialStation import ClusterPrinterMaterialStation
 from .ClusterPrinterMaterialStationSlot import ClusterPrinterMaterialStationSlot
+from .ClusterPrinterConfigurationMaterial import ClusterPrinterConfigurationMaterial
 from ..BaseModel import BaseModel
 
 
@@ -80,9 +81,9 @@ class ClusterPrinterStatus(BaseModel):
         model.setCameraUrl(QUrl("http://{}:8080/?action=stream".format(self.ip_address)))
 
         # Set the possible configurations based on whether a Material Station is present or not.
-        if self.material_station is not None and len(self.material_station.material_slots):
+        if self.material_station and self.material_station.material_slots:
             self._updateAvailableConfigurations(model)
-        if self.configuration is not None:
+        if self.configuration:
             self._updateActiveConfiguration(model)
 
     def _updateActiveConfiguration(self, model: PrinterOutputModel) -> None:
@@ -92,31 +93,36 @@ class ClusterPrinterStatus(BaseModel):
             configuration.updateConfigurationModel(extruder_config)
 
     def _updateAvailableConfigurations(self, model: PrinterOutputModel) -> None:
-        # Generate a list of configurations for the left extruder.
-        left_configurations = [slot for slot in self.material_station.material_slots if self._isSupportedConfiguration(
-            slot = slot,
-            extruder_index = 0
-        )]
-        # Generate a list of configurations for the right extruder.
-        right_configurations = [slot for slot in self.material_station.material_slots if self._isSupportedConfiguration(
-            slot = slot,
-            extruder_index = 1
-        )]
-        # Create a list of all available combinations between both print cores.
         available_configurations = [self._createAvailableConfigurationFromPrinterConfiguration(
             left_slot = left_slot,
             right_slot = right_slot,
             printer_configuration = model.printerConfiguration
-        ) for left_slot, right_slot in product(left_configurations, right_configurations)]
-        # Let Cura know which available configurations there are.
+        ) for left_slot, right_slot in product(self._getSlotsForExtruder(0), self._getSlotsForExtruder(1))]
         model.setAvailableConfigurations(available_configurations)
 
+    ## Create a list of Material Station slots for the given extruder index.
+    #  Returns a list with a single empty material slot if none are found to ensure we don't miss configurations.
+    def _getSlotsForExtruder(self, extruder_index: int) -> List[ClusterPrinterMaterialStationSlot]:
+        if not self.material_station:  # typing guard
+            return []
+        slots = [slot for slot in self.material_station.material_slots if self._isSupportedConfiguration(
+            slot = slot,
+            extruder_index = extruder_index
+        )]
+        return slots or [self._createEmptyMaterialSlot(extruder_index)]
+
     ## Check if a configuration is supported in order to make it selectable by the user.
     #  We filter out any slot that is not supported by the extruder index, print core type or if the material is empty.
     @staticmethod
     def _isSupportedConfiguration(slot: ClusterPrinterMaterialStationSlot, extruder_index: int) -> bool:
-        return slot.extruder_index == extruder_index and slot.compatible and slot.material and \
-               slot.material_remaining != 0
+        return slot.extruder_index == extruder_index and slot.compatible
+
+    ## Create an empty material slot with a fake empty material.
+    @staticmethod
+    def _createEmptyMaterialSlot(extruder_index: int) -> ClusterPrinterMaterialStationSlot:
+        empty_material = ClusterPrinterConfigurationMaterial(guid = "", material = "empty", brand = "", color = "")
+        return ClusterPrinterMaterialStationSlot(slot_index = 0, extruder_index = extruder_index,
+                                                 compatible = True, material_remaining = 0, material = empty_material)
 
     @staticmethod
     def _createAvailableConfigurationFromPrinterConfiguration(left_slot: ClusterPrinterMaterialStationSlot,
diff --git a/plugins/UM3NetworkPrinting/src/Models/Http/__init__.py b/plugins/UM3NetworkPrinting/src/Models/Http/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/plugins/UM3NetworkPrinting/src/Network/ClusterApiClient.py b/plugins/UM3NetworkPrinting/src/Network/ClusterApiClient.py
index 982c3a885d..951b69977d 100644
--- a/plugins/UM3NetworkPrinting/src/Network/ClusterApiClient.py
+++ b/plugins/UM3NetworkPrinting/src/Network/ClusterApiClient.py
@@ -13,6 +13,7 @@ from ..Models.BaseModel import BaseModel
 from ..Models.Http.ClusterPrintJobStatus import ClusterPrintJobStatus
 from ..Models.Http.ClusterPrinterStatus import ClusterPrinterStatus
 from ..Models.Http.PrinterSystemStatus import PrinterSystemStatus
+from ..Models.Http.ClusterMaterial import ClusterMaterial
 
 
 ## The generic type variable used to document the methods below.
@@ -44,6 +45,13 @@ class ClusterApiClient:
         reply = self._manager.get(self._createEmptyRequest(url))
         self._addCallback(reply, on_finished, PrinterSystemStatus)
 
+    ## Get the installed materials on the printer.
+    #  \param on_finished: The callback in case the response is successful.
+    def getMaterials(self, on_finished: Callable[[List[ClusterMaterial]], Any]) -> None:
+        url = "{}/materials".format(self.CLUSTER_API_PREFIX)
+        reply = self._manager.get(self._createEmptyRequest(url))
+        self._addCallback(reply, on_finished, ClusterMaterial)
+
     ## Get the printers in the cluster.
     #  \param on_finished: The callback in case the response is successful.
     def getPrinters(self, on_finished: Callable[[List[ClusterPrinterStatus]], Any]) -> None:
@@ -62,7 +70,7 @@ class ClusterApiClient:
     def movePrintJobToTop(self, print_job_uuid: str) -> None:
         url = "{}/print_jobs/{}/action/move".format(self.CLUSTER_API_PREFIX, print_job_uuid)
         self._manager.post(self._createEmptyRequest(url), json.dumps({"to_position": 0, "list": "queued"}).encode())
-    
+
     ## Override print job configuration and force it to be printed.
     def forcePrintJob(self, print_job_uuid: str) -> None:
         url = "{}/print_jobs/{}".format(self.CLUSTER_API_PREFIX, print_job_uuid)
diff --git a/plugins/UM3NetworkPrinting/src/Network/LocalClusterOutputDevice.py b/plugins/UM3NetworkPrinting/src/Network/LocalClusterOutputDevice.py
index 3d71429ef8..a5a885a4ed 100644
--- a/plugins/UM3NetworkPrinting/src/Network/LocalClusterOutputDevice.py
+++ b/plugins/UM3NetworkPrinting/src/Network/LocalClusterOutputDevice.py
@@ -1,6 +1,6 @@
 # Copyright (c) 2019 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
-from typing import Optional, Dict, List
+from typing import Optional, Dict, List, Callable, Any
 
 from PyQt5.QtGui import QDesktopServices
 from PyQt5.QtCore import pyqtSlot, QUrl, pyqtSignal, pyqtProperty
@@ -13,12 +13,13 @@ from cura.PrinterOutput.NetworkedPrinterOutputDevice import AuthState
 from cura.PrinterOutput.PrinterOutputDevice import ConnectionType
 
 from .ClusterApiClient import ClusterApiClient
+from .SendMaterialJob import SendMaterialJob
 from ..ExportFileJob import ExportFileJob
-from ..SendMaterialJob import SendMaterialJob
 from ..UltimakerNetworkedPrinterOutputDevice import UltimakerNetworkedPrinterOutputDevice
 from ..Messages.PrintJobUploadBlockedMessage import PrintJobUploadBlockedMessage
 from ..Messages.PrintJobUploadErrorMessage import PrintJobUploadErrorMessage
 from ..Messages.PrintJobUploadSuccessMessage import PrintJobUploadSuccessMessage
+from ..Models.Http.ClusterMaterial import ClusterMaterial
 
 
 I18N_CATALOG = i18nCatalog("cura")
@@ -100,10 +101,14 @@ class LocalClusterOutputDevice(UltimakerNetworkedPrinterOutputDevice):
         self._getApiClient().getPrintJobs(self._updatePrintJobs)
         self._updatePrintJobPreviewImages()
 
+    ## Get a list of materials that are installed on the cluster host.
+    def getMaterials(self, on_finished: Callable[[List[ClusterMaterial]], Any]) -> None:
+        self._getApiClient().getMaterials(on_finished = on_finished)
+
     ## Sync the material profiles in Cura with the printer.
     #  This gets called when connecting to a printer as well as when sending a print.
     def sendMaterialProfiles(self) -> None:
-        job = SendMaterialJob(device=self)
+        job = SendMaterialJob(device = self)
         job.run()
 
     ## Send a print job to the cluster.
@@ -133,6 +138,7 @@ class LocalClusterOutputDevice(UltimakerNetworkedPrinterOutputDevice):
             self._createFormPart("name=owner", bytes(self._getUserName(), "utf-8"), "text/plain"),
             self._createFormPart("name=\"file\"; filename=\"%s\"" % job.getFileName(), job.getOutput())
         ]
+        # FIXME: move form posting to API client
         self.postFormWithParts("/cluster-api/v1/print_jobs/", parts, on_finished=self._onPrintUploadCompleted,
                                on_progress=self._onPrintJobUploadProgress)
 
diff --git a/plugins/UM3NetworkPrinting/src/SendMaterialJob.py b/plugins/UM3NetworkPrinting/src/Network/SendMaterialJob.py
similarity index 66%
rename from plugins/UM3NetworkPrinting/src/SendMaterialJob.py
rename to plugins/UM3NetworkPrinting/src/Network/SendMaterialJob.py
index 0186783f1f..83b88341fb 100644
--- a/plugins/UM3NetworkPrinting/src/SendMaterialJob.py
+++ b/plugins/UM3NetworkPrinting/src/Network/SendMaterialJob.py
@@ -1,19 +1,19 @@
 # Copyright (c) 2019 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
-import json
 import os
-from typing import Dict, TYPE_CHECKING, Set, Optional
+from typing import Dict, TYPE_CHECKING, Set, List
 from PyQt5.QtNetwork import QNetworkReply, QNetworkRequest
 
 from UM.Job import Job
 from UM.Logger import Logger
 from cura.CuraApplication import CuraApplication
 
-from .Models.ClusterMaterial import ClusterMaterial
-from .Models.LocalMaterial import LocalMaterial
+from ..Models.Http.ClusterMaterial import ClusterMaterial
+from ..Models.LocalMaterial import LocalMaterial
+from ..Messages.MaterialSyncMessage import MaterialSyncMessage
 
 if TYPE_CHECKING:
-    from .Network.LocalClusterOutputDevice import LocalClusterOutputDevice
+    from .LocalClusterOutputDevice import LocalClusterOutputDevice
 
 
 ##  Asynchronous job to send material profiles to the printer.
@@ -27,62 +27,43 @@ class SendMaterialJob(Job):
 
     ##  Send the request to the printer and register a callback
     def run(self) -> None:
-        self.device.get("materials/", on_finished = self._onGetRemoteMaterials)
+        self.device.getMaterials(on_finished = self._onGetMaterials)
 
-    ##  Process the materials reply from the printer.
-    #
-    #   \param reply The reply from the printer, a json file.
-    def _onGetRemoteMaterials(self, reply: QNetworkReply) -> None:
-        # Got an error from the HTTP request. If we did not receive a 200 something happened.
-        if reply.attribute(QNetworkRequest.HttpStatusCodeAttribute) != 200:
-            Logger.log("e", "Error fetching materials from printer: %s", reply.errorString())
-            return
-
-        # Collect materials from the printer's reply and send the missing ones if needed.
-        remote_materials_by_guid = self._parseReply(reply)
-        if remote_materials_by_guid:
-            self._sendMissingMaterials(remote_materials_by_guid)
+    ##  Callback for when the remote materials were returned.
+    def _onGetMaterials(self, materials: List[ClusterMaterial]) -> None:
+        remote_materials_by_guid = {material.guid: material for material in materials}
+        self._sendMissingMaterials(remote_materials_by_guid)
 
     ##  Determine which materials should be updated and send them to the printer.
-    #
     #   \param remote_materials_by_guid The remote materials by GUID.
     def _sendMissingMaterials(self, remote_materials_by_guid: Dict[str, ClusterMaterial]) -> None:
-        # Collect local materials
         local_materials_by_guid = self._getLocalMaterials()
         if len(local_materials_by_guid) == 0:
             Logger.log("d", "There are no local materials to synchronize with the printer.")
             return
-
-        # Find out what materials are new or updated and must be sent to the printer
         material_ids_to_send = self._determineMaterialsToSend(local_materials_by_guid, remote_materials_by_guid)
         if len(material_ids_to_send) == 0:
             Logger.log("d", "There are no remote materials to update.")
             return
-
-        # Send materials to the printer
         self._sendMaterials(material_ids_to_send)
 
     ##  From the local and remote materials, determine which ones should be synchronized.
-    #
     #   Makes a Set of id's containing only the id's of the materials that are not on the printer yet or the ones that
     #   are newer in Cura.
-    #
     #   \param local_materials The local materials by GUID.
     #   \param remote_materials The remote materials by GUID.
     @staticmethod
     def _determineMaterialsToSend(local_materials: Dict[str, LocalMaterial],
                                   remote_materials: Dict[str, ClusterMaterial]) -> Set[str]:
         return {
-            material.id
-            for guid, material in local_materials.items()
-            if guid not in remote_materials or material.version > remote_materials[guid].version
+            local_material.id
+            for guid, local_material in local_materials.items()
+            if guid not in remote_materials.keys() or local_material.version > remote_materials[guid].version
         }
 
     ##  Send the materials to the printer.
-    #
     #   The given materials will be loaded from disk en sent to to printer.
     #   The given id's will be matched with filenames of the locally stored materials.
-    #
     #   \param materials_to_send A set with id's of materials that must be sent.
     def _sendMaterials(self, materials_to_send: Set[str]) -> None:
         container_registry = CuraApplication.getInstance().getContainerRegistry()
@@ -103,9 +84,7 @@ class SendMaterialJob(Job):
             self._sendMaterialFile(file_path, file_name, root_material_id)
 
     ##  Send a single material file to the printer.
-    #
     #   Also add the material signature file if that is available.
-    #
     #   \param file_path The path of the material file.
     #   \param file_name The name of the material file.
     #   \param material_id The ID of the material in the file.
@@ -125,48 +104,32 @@ class SendMaterialJob(Job):
                 parts.append(self.device.createFormPart("name=\"signature_file\"; filename=\"{file_name}\""
                                                         .format(file_name = signature_file_name), f.read()))
 
-        Logger.log("d", "Syncing material {material_id} with cluster.".format(material_id = material_id))
-        self.device.postFormWithParts(target = "/materials/", parts = parts, on_finished = self.sendingFinished)
+        Logger.log("d", "Syncing material %s with cluster.", material_id)
+        # FIXME: move form posting to API client
+        self.device.postFormWithParts(target = "/cluster-api/v1/materials/", parts = parts,
+                                      on_finished = self._sendingFinished)
 
     ##  Check a reply from an upload to the printer and log an error when the call failed
-    @staticmethod
-    def sendingFinished(reply: QNetworkReply) -> None:
+    def _sendingFinished(self, reply: QNetworkReply) -> None:
         if reply.attribute(QNetworkRequest.HttpStatusCodeAttribute) != 200:
-            Logger.log("e", "Received error code from printer when syncing material: {code}, {text}".format(
-                code = reply.attribute(QNetworkRequest.HttpStatusCodeAttribute),
-                text = reply.errorString()
-            ))
-
-    ##  Parse the reply from the printer
-    #
-    #   Parses the reply to a "/materials" request to the printer
-    #
-    #   \return a dictionary of ClusterMaterial objects by GUID
-    #   \throw KeyError Raised when on of the materials does not include a valid guid
-    @classmethod
-    def _parseReply(cls, reply: QNetworkReply) -> Optional[Dict[str, ClusterMaterial]]:
-        try:
-            remote_materials = json.loads(reply.readAll().data().decode("utf-8"))
-            return {material["guid"]: ClusterMaterial(**material) for material in remote_materials}
-        except UnicodeDecodeError:
-            Logger.log("e", "Request material storage on printer: I didn't understand the printer's answer.")
-        except json.JSONDecodeError:
-            Logger.log("e", "Request material storage on printer: I didn't understand the printer's answer.")
-        except ValueError:
-            Logger.log("e", "Request material storage on printer: Printer's answer had an incorrect value.")
-        except TypeError:
-            Logger.log("e", "Request material storage on printer: Printer's answer was missing a required value.")
-        return None
+            Logger.log("w", "Error while syncing material: %s", reply.errorString())
+            return
+        body = reply.readAll().data().decode('utf8')
+        if "not added" in body:
+            # For some reason the cluster returns a 200 sometimes even when syncing failed.
+            Logger.log("w", "Error while syncing material: %s", body)
+            return
+        # Inform the user that materials have been synced. This message only shows itself when not already visible.
+        # Because of the guards above it is not shown when syncing failed (which is not always an actual problem).
+        MaterialSyncMessage(self.device).show()
 
     ##  Retrieves a list of local materials
-    #
     #   Only the new newest version of the local materials is returned
-    #
     #   \return a dictionary of LocalMaterial objects by GUID
-    def _getLocalMaterials(self) -> Dict[str, LocalMaterial]:
+    @staticmethod
+    def _getLocalMaterials() -> Dict[str, LocalMaterial]:
         result = {}  # type: Dict[str, LocalMaterial]
         material_manager = CuraApplication.getInstance().getMaterialManager()
-
         material_group_dict = material_manager.getAllMaterialGroups()
 
         # Find the latest version of all material containers in the registry.
diff --git a/plugins/UM3NetworkPrinting/tests/TestSendMaterialJob.py b/plugins/UM3NetworkPrinting/tests/TestSendMaterialJob.py
deleted file mode 100644
index 61323861b6..0000000000
--- a/plugins/UM3NetworkPrinting/tests/TestSendMaterialJob.py
+++ /dev/null
@@ -1,244 +0,0 @@
-# Copyright (c) 2019 Ultimaker B.V.
-# Copyright (c) 2019 Ultimaker B.V.
-# Cura is released under the terms of the LGPLv3 or higher.
-import io
-import json
-from unittest import TestCase, mock
-from unittest.mock import patch, call, MagicMock
-
-from PyQt5.QtCore import QByteArray
-
-from UM.Application import Application
-
-from cura.Machines.MaterialGroup import MaterialGroup
-from cura.Machines.MaterialNode import MaterialNode
-
-from ..src.SendMaterialJob import SendMaterialJob
-
-_FILES_MAP = {"generic_pla_white": "/materials/generic_pla_white.xml.fdm_material",
-              "generic_pla_black": "/materials/generic_pla_black.xml.fdm_material",
-              }
-
-
-@patch("builtins.open", lambda _, __: io.StringIO("<xml></xml>"))
-class TestSendMaterialJob(TestCase):
-    # version 1
-    _LOCAL_MATERIAL_WHITE = {"type": "material", "status": "unknown", "id": "generic_pla_white",
-                             "base_file": "generic_pla_white", "setting_version": "5", "name": "White PLA",
-                             "brand": "Generic", "material": "PLA", "color_name": "White",
-                             "GUID": "badb0ee7-87c8-4f3f-9398-938587b67dce", "version": "1", "color_code": "#ffffff",
-                             "description": "Test PLA White", "adhesion_info": "Use glue.", "approximate_diameter": "3",
-                             "properties": {"density": "1.00", "diameter": "2.85", "weight": "750"},
-                             "definition": "fdmprinter", "compatible": True}
-
-    # version 2
-    _LOCAL_MATERIAL_WHITE_NEWER = {"type": "material", "status": "unknown", "id": "generic_pla_white",
-                                   "base_file": "generic_pla_white", "setting_version": "5", "name": "White PLA",
-                                   "brand": "Generic", "material": "PLA", "color_name": "White",
-                                   "GUID": "badb0ee7-87c8-4f3f-9398-938587b67dce", "version": "2",
-                                   "color_code": "#ffffff",
-                                   "description": "Test PLA White", "adhesion_info": "Use glue.",
-                                   "approximate_diameter": "3",
-                                   "properties": {"density": "1.00", "diameter": "2.85", "weight": "750"},
-                                   "definition": "fdmprinter", "compatible": True}
-
-    # invalid version: "one"
-    _LOCAL_MATERIAL_WHITE_INVALID_VERSION = {"type": "material", "status": "unknown", "id": "generic_pla_white",
-                                             "base_file": "generic_pla_white", "setting_version": "5", "name": "White PLA",
-                                             "brand": "Generic", "material": "PLA", "color_name": "White",
-                                             "GUID": "badb0ee7-87c8-4f3f-9398-938587b67dce", "version": "one",
-                                             "color_code": "#ffffff",
-                                             "description": "Test PLA White", "adhesion_info": "Use glue.",
-                                             "approximate_diameter": "3",
-                                             "properties": {"density": "1.00", "diameter": "2.85", "weight": "750"},
-                                             "definition": "fdmprinter", "compatible": True}
-
-    _LOCAL_MATERIAL_WHITE_ALL_RESULT = {"generic_pla_white": MaterialGroup("generic_pla_white",
-                                                                           MaterialNode(_LOCAL_MATERIAL_WHITE))}
-
-    _LOCAL_MATERIAL_WHITE_NEWER_ALL_RESULT = {"generic_pla_white": MaterialGroup("generic_pla_white",
-                                                                                 MaterialNode(_LOCAL_MATERIAL_WHITE_NEWER))}
-
-    _LOCAL_MATERIAL_WHITE_INVALID_VERSION_ALL_RESULT = {"generic_pla_white": MaterialGroup("generic_pla_white",
-                                                                                           MaterialNode(_LOCAL_MATERIAL_WHITE_INVALID_VERSION))}
-
-    _LOCAL_MATERIAL_BLACK = {"type": "material", "status": "unknown", "id": "generic_pla_black",
-                             "base_file": "generic_pla_black", "setting_version": "5", "name": "Yellow CPE",
-                             "brand": "Ultimaker", "material": "CPE", "color_name": "Black",
-                             "GUID": "5fbb362a-41f9-4818-bb43-15ea6df34aa4", "version": "1", "color_code": "#000000",
-                             "description": "Test PLA Black", "adhesion_info": "Use glue.", "approximate_diameter": "3",
-                             "properties": {"density": "1.01", "diameter": "2.85", "weight": "750"},
-                             "definition": "fdmprinter", "compatible": True}
-
-    _LOCAL_MATERIAL_BLACK_ALL_RESULT = {"generic_pla_black": MaterialGroup("generic_pla_black",
-                                                                           MaterialNode(_LOCAL_MATERIAL_BLACK))}
-
-    _REMOTE_MATERIAL_WHITE = {
-        "guid": "badb0ee7-87c8-4f3f-9398-938587b67dce",
-        "material": "PLA",
-        "brand": "Generic",
-        "version": 1,
-        "color": "White",
-        "density": 1.00
-    }
-
-    _REMOTE_MATERIAL_BLACK = {
-        "guid": "5fbb362a-41f9-4818-bb43-15ea6df34aa4",
-        "material": "PLA",
-        "brand": "Generic",
-        "version": 2,
-        "color": "Black",
-        "density": 1.00
-    }
-
-    def test_run(self):
-        device_mock = MagicMock()
-        job = SendMaterialJob(device_mock)
-        job.run()
-
-        # We expect the materials endpoint to be called when the job runs.
-        device_mock.get.assert_called_with("materials/", on_finished = job._onGetRemoteMaterials)
-
-    def test__onGetRemoteMaterials_withFailedRequest(self):
-        reply_mock = MagicMock()
-        device_mock = MagicMock()
-        reply_mock.attribute.return_value = 404
-        job = SendMaterialJob(device_mock)
-        job._onGetRemoteMaterials(reply_mock)
-
-        # We expect the device not to be called for any follow up.
-        self.assertEqual(0, device_mock.createFormPart.call_count)
-
-    def test__onGetRemoteMaterials_withWrongEncoding(self):
-        reply_mock = MagicMock()
-        device_mock = MagicMock()
-        reply_mock.attribute.return_value = 200
-        reply_mock.readAll.return_value = QByteArray(json.dumps([self._REMOTE_MATERIAL_WHITE]).encode("cp500"))
-        job = SendMaterialJob(device_mock)
-        job._onGetRemoteMaterials(reply_mock)
-
-        # Given that the parsing fails we do no expect the device to be called for any follow up.
-        self.assertEqual(0, device_mock.createFormPart.call_count)
-
-    def test__onGetRemoteMaterials_withBadJsonAnswer(self):
-        reply_mock = MagicMock()
-        device_mock = MagicMock()
-        reply_mock.attribute.return_value = 200
-        reply_mock.readAll.return_value = QByteArray(b"Six sick hicks nick six slick bricks with picks and sticks.")
-        job = SendMaterialJob(device_mock)
-        job._onGetRemoteMaterials(reply_mock)
-
-        # Given that the parsing fails we do no expect the device to be called for any follow up.
-        self.assertEqual(0, device_mock.createFormPart.call_count)
-
-    def test__onGetRemoteMaterials_withMissingGuidInRemoteMaterial(self):
-        reply_mock = MagicMock()
-        device_mock = MagicMock()
-        reply_mock.attribute.return_value = 200
-        remote_material_without_guid = self._REMOTE_MATERIAL_WHITE.copy()
-        del remote_material_without_guid["guid"]
-        reply_mock.readAll.return_value = QByteArray(json.dumps([remote_material_without_guid]).encode("ascii"))
-        job = SendMaterialJob(device_mock)
-        job._onGetRemoteMaterials(reply_mock)
-
-        # Given that parsing fails we do not expect the device to be called for any follow up.
-        self.assertEqual(0, device_mock.createFormPart.call_count)
-
-    @patch("cura.Machines.MaterialManager.MaterialManager")
-    @patch("cura.Settings.CuraContainerRegistry")
-    @patch("UM.Application")
-    def test__onGetRemoteMaterials_withInvalidVersionInLocalMaterial(self, application_mock, container_registry_mock,
-                                                                     material_manager_mock):
-        reply_mock = MagicMock()
-        device_mock = MagicMock()
-        application_mock.getContainerRegistry.return_value = container_registry_mock
-        application_mock.getMaterialManager.return_value = material_manager_mock
-
-        reply_mock.attribute.return_value = 200
-        reply_mock.readAll.return_value = QByteArray(json.dumps([self._REMOTE_MATERIAL_WHITE]).encode("ascii"))
-
-        material_manager_mock.getAllMaterialGroups.return_value = self._LOCAL_MATERIAL_WHITE_INVALID_VERSION_ALL_RESULT.copy()
-
-        with mock.patch.object(Application, "getInstance", new = lambda: application_mock):
-            job = SendMaterialJob(device_mock)
-            job._onGetRemoteMaterials(reply_mock)
-
-        self.assertEqual(0, device_mock.createFormPart.call_count)
-
-    @patch("UM.Application.Application.getInstance")
-    def test__onGetRemoteMaterials_withNoUpdate(self, application_mock):
-        reply_mock = MagicMock()
-        device_mock = MagicMock()
-        container_registry_mock = application_mock.getContainerRegistry.return_value
-        material_manager_mock = application_mock.getMaterialManager.return_value
-
-        device_mock.createFormPart.return_value = "_xXx_"
-
-        material_manager_mock.getAllMaterialGroups.return_value = self._LOCAL_MATERIAL_WHITE_ALL_RESULT.copy()
-
-        reply_mock.attribute.return_value = 200
-        reply_mock.readAll.return_value = QByteArray(json.dumps([self._REMOTE_MATERIAL_WHITE]).encode("ascii"))
-
-        with mock.patch.object(Application, "getInstance", new = lambda: application_mock):
-            job = SendMaterialJob(device_mock)
-            job._onGetRemoteMaterials(reply_mock)
-
-        self.assertEqual(0, device_mock.createFormPart.call_count)
-        self.assertEqual(0, device_mock.postFormWithParts.call_count)
-
-    @patch("UM.Application.Application.getInstance")
-    def test__onGetRemoteMaterials_withUpdatedMaterial(self, get_instance_mock):
-        reply_mock = MagicMock()
-        device_mock = MagicMock()
-        application_mock = get_instance_mock.return_value
-        container_registry_mock = application_mock.getContainerRegistry.return_value
-        material_manager_mock = application_mock.getMaterialManager.return_value
-
-        container_registry_mock.getContainerFilePathById = lambda x: _FILES_MAP.get(x)
-
-        device_mock.createFormPart.return_value = "_xXx_"
-
-        material_manager_mock.getAllMaterialGroups.return_value = self._LOCAL_MATERIAL_WHITE_NEWER_ALL_RESULT.copy()
-
-        reply_mock.attribute.return_value = 200
-        reply_mock.readAll.return_value = QByteArray(json.dumps([self._REMOTE_MATERIAL_WHITE]).encode("ascii"))
-
-        job = SendMaterialJob(device_mock)
-        job._onGetRemoteMaterials(reply_mock)
-
-        self.assertEqual(1, device_mock.createFormPart.call_count)
-        self.assertEqual(1, device_mock.postFormWithParts.call_count)
-        self.assertEqual(
-            [call.createFormPart("name=\"file\"; filename=\"generic_pla_white.xml.fdm_material\"", "<xml></xml>"),
-             call.postFormWithParts(target = "/materials/", parts = ["_xXx_"], on_finished = job.sendingFinished)],
-            device_mock.method_calls)
-
-    @patch("UM.Application.Application.getInstance")
-    def test__onGetRemoteMaterials_withNewMaterial(self, application_mock):
-        reply_mock = MagicMock()
-        device_mock = MagicMock()
-        container_registry_mock = application_mock.getContainerRegistry.return_value
-        material_manager_mock = application_mock.getMaterialManager.return_value
-
-        container_registry_mock.getContainerFilePathById = lambda x: _FILES_MAP.get(x)
-
-        device_mock.createFormPart.return_value = "_xXx_"
-
-        all_results = self._LOCAL_MATERIAL_WHITE_ALL_RESULT.copy()
-        for key, value in self._LOCAL_MATERIAL_BLACK_ALL_RESULT.items():
-            all_results[key] = value
-        material_manager_mock.getAllMaterialGroups.return_value = all_results
-
-        reply_mock.attribute.return_value = 200
-        reply_mock.readAll.return_value = QByteArray(json.dumps([self._REMOTE_MATERIAL_BLACK]).encode("ascii"))
-
-        with mock.patch.object(Application, "getInstance", new = lambda: application_mock):
-            job = SendMaterialJob(device_mock)
-            job._onGetRemoteMaterials(reply_mock)
-
-        self.assertEqual(1, device_mock.createFormPart.call_count)
-        self.assertEqual(1, device_mock.postFormWithParts.call_count)
-        self.assertEqual(
-            [call.createFormPart("name=\"file\"; filename=\"generic_pla_white.xml.fdm_material\"", "<xml></xml>"),
-             call.postFormWithParts(target = "/materials/", parts = ["_xXx_"], on_finished = job.sendingFinished)],
-            device_mock.method_calls)
diff --git a/plugins/UM3NetworkPrinting/tests/__init__.py b/plugins/UM3NetworkPrinting/tests/__init__.py
deleted file mode 100644
index d5641e902f..0000000000
--- a/plugins/UM3NetworkPrinting/tests/__init__.py
+++ /dev/null
@@ -1,2 +0,0 @@
-# Copyright (c) 2019 Ultimaker B.V.
-# Cura is released under the terms of the LGPLv3 or higher.