Merge branch 'master' into CURA-5536_installed_check

cura/CuraApplication.py

@@ -5,6 +5,7 @@ import copy
 import os
 import sys
 import time
+from typing import cast, TYPE_CHECKING, Optional
 
 import numpy
 
@@ -13,8 +14,6 @@ from PyQt5.QtGui import QColor, QIcon
 from PyQt5.QtWidgets import QMessageBox
 from PyQt5.QtQml import qmlRegisterUncreatableType, qmlRegisterSingletonType, qmlRegisterType
 
-from typing import cast, TYPE_CHECKING
-
 from UM.Scene.SceneNode import SceneNode
 from UM.Scene.Camera import Camera
 from UM.Math.Vector import Vector
@@ -97,6 +96,8 @@ from . import CuraSplashScreen
 from . import CameraImageProvider
 from . import MachineActionManager
 
+from cura.TaskManagement.OnExitCallbackManager import OnExitCallbackManager
+
 from cura.Settings.MachineManager import MachineManager
 from cura.Settings.ExtruderManager import ExtruderManager
 from cura.Settings.UserChangesModel import UserChangesModel
@@ -158,6 +159,8 @@ class CuraApplication(QtApplication):
 
         self._boot_loading_time = time.time()
 
+        self._on_exit_callback_manager = OnExitCallbackManager(self)
+
         # Variables set from CLI
         self._files_to_open = []
         self._use_single_instance = False
@@ -279,6 +282,8 @@ class CuraApplication(QtApplication):
         self._machine_action_manager = MachineActionManager.MachineActionManager(self)
         self._machine_action_manager.initialize()
 
+        self.change_log_url = "https://ultimaker.com/ultimaker-cura-latest-features"
+
     def __sendCommandToSingleInstance(self):
         self._single_instance = SingleInstance(self, self._files_to_open)
 
@@ -520,8 +525,8 @@ class CuraApplication(QtApplication):
     def setNeedToShowUserAgreement(self, set_value = True):
         self._need_to_show_user_agreement = set_value
 
-    ## The "Quit" button click event handler.
-    @pyqtSlot()
+    # DO NOT call this function to close the application, use checkAndExitApplication() instead which will perform
+    # pre-exit checks such as checking for in-progress USB printing, etc.
     def closeApplication(self):
         Logger.log("i", "Close application")
         main_window = self.getMainWindow()
@@ -530,6 +535,32 @@ class CuraApplication(QtApplication):
         else:
             self.exit(0)
 
+    # This function first performs all upon-exit checks such as USB printing that is in progress.
+    # Use this to close the application.
+    @pyqtSlot()
+    def checkAndExitApplication(self) -> None:
+        self._on_exit_callback_manager.resetCurrentState()
+        self._on_exit_callback_manager.triggerNextCallback()
+
+    @pyqtSlot(result = bool)
+    def getIsAllChecksPassed(self) -> bool:
+        return self._on_exit_callback_manager.getIsAllChecksPassed()
+
+    def getOnExitCallbackManager(self) -> "OnExitCallbackManager":
+        return self._on_exit_callback_manager
+
+    def triggerNextExitCheck(self) -> None:
+        self._on_exit_callback_manager.triggerNextCallback()
+
+    showConfirmExitDialog = pyqtSignal(str, arguments = ["message"])
+
+    def setConfirmExitDialogCallback(self, callback):
+        self._confirm_exit_dialog_callback = callback
+
+    @pyqtSlot(bool)
+    def callConfirmExitDialogCallback(self, yes_or_no: bool):
+        self._confirm_exit_dialog_callback(yes_or_no)
+
     ##  Signal to connect preferences action in QML
     showPreferencesWindow = pyqtSignal()
 
@@ -1701,22 +1732,3 @@ class CuraApplication(QtApplication):
     @pyqtSlot()
     def showMoreInformationDialogForAnonymousDataCollection(self):
         cast(SliceInfo, self._plugin_registry.getPluginObject("SliceInfoPlugin")).showMoreInfoDialog()
-
-    ##  Signal to check whether the application can be closed or not
-    checkCuraCloseChange = pyqtSignal()
-
-    # This variable is necessary to ensure that all methods that were subscribed for the checkCuraCloseChange event
-    # have been passed checks
-    _isCuraCanBeClosed = True
-
-    def setCuraCanBeClosed(self, value: bool):
-        self._isCuraCanBeClosed = value
-
-    @pyqtSlot(result=bool)
-    def preCloseEventHandler(self)-> bool:
-
-        # If any of checks failed then then _isCuraCanBeClosed should be set to False and Cura will not be closed
-        # after clicking the quit button
-        self.checkCuraCloseChange.emit()
-
-        return self._isCuraCanBeClosed

cura/Settings/ContainerManager.py

@@ -46,19 +46,21 @@ class ContainerManager(QObject):
         self._quality_manager = self._application.getQualityManager()
         self._container_name_filters = {}   # type: Dict[str, Dict[str, Any]]
 
-    @pyqtSlot(str, str, str, result=str)
-    def getContainerMetaDataEntry(self, container_id, entry_name, sub_entry: Optional[str] = None):
+    @pyqtSlot(str, str, result=str)
+    def getContainerMetaDataEntry(self, container_id: str, entry_names: str) -> str:
         metadatas = self._container_registry.findContainersMetadata(id = container_id)
         if not metadatas:
             Logger.log("w", "Could not get metadata of container %s because it was not found.", container_id)
             return ""
 
-        sub_data = metadatas[0].get(entry_name, "")
-        result = str(sub_data)
-        if sub_entry:
-            result = str(sub_data.get(sub_entry, ""))
-
-        return result
+        entries = entry_names.split("/")
+        result = metadatas[0]
+        while entries:
+            entry = entries.pop(0)
+            result = result.get(entry, {})
+        if not result:
+            return ""
+        return str(result)
 
     ##  Set a metadata entry of the specified container.
     #
@@ -73,6 +75,7 @@ class ContainerManager(QObject):
     #
     #   \return True if successful, False if not.
     #  TODO: This is ONLY used by MaterialView for material containers. Maybe refactor this.
+    #  Update: In order for QML to use objects and sub objects, those (sub) objects must all be QObject. Is that what we want?
     @pyqtSlot("QVariant", str, str)
     def setContainerMetaDataEntry(self, container_node, entry_name, entry_value):
         root_material_id = container_node.metadata["base_file"]
@@ -107,63 +110,6 @@ class ContainerManager(QObject):
             if sub_item_changed: #If it was only a sub-item that has changed then the setMetaDataEntry won't correctly notice that something changed, and we must manually signal that the metadata changed.
                 container.metaDataChanged.emit(container)
 
-    ##  Set a setting property of the specified container.
-    #
-    #   This will set the specified property of the specified setting of the container
-    #   and all containers that share the same base_file (if any). The latter only
-    #   happens for material containers.
-    #
-    #   \param container_id \type{str} The ID of the container to change.
-    #   \param setting_key \type{str} The key of the setting.
-    #   \param property_name \type{str} The name of the property, eg "value".
-    #   \param property_value \type{str} The new value of the property.
-    #
-    #   \return True if successful, False if not.
-    @pyqtSlot(str, str, str, str, result = bool)
-    def setContainerProperty(self, container_id, setting_key, property_name, property_value):
-        if self._container_registry.isReadOnly(container_id):
-            Logger.log("w", "Cannot set properties of read-only container %s.", container_id)
-            return False
-
-        containers = self._container_registry.findContainers(id = container_id)
-        if not containers:
-            Logger.log("w", "Could not set properties of container %s because it was not found.", container_id)
-            return False
-
-        container = containers[0]
-
-        container.setProperty(setting_key, property_name, property_value)
-
-        basefile = container.getMetaDataEntry("base_file", container_id)
-        for sibbling_container in self._container_registry.findInstanceContainers(base_file = basefile):
-            if sibbling_container != container:
-                sibbling_container.setProperty(setting_key, property_name, property_value)
-
-        return True
-
-    ##  Get a setting property of the specified container.
-    #
-    #   This will get the specified property of the specified setting of the
-    #   specified container.
-    #
-    #   \param container_id The ID of the container to get the setting property
-    #   of.
-    #   \param setting_key The key of the setting to get the property of.
-    #   \param property_name The property to obtain.
-    #   \return The value of the specified property. The type of this property
-    #   value depends on the type of the property. For instance, the "value"
-    #   property of an integer setting will be a Python int, but the "value"
-    #   property of an enum setting will be a Python str.
-    @pyqtSlot(str, str, str, result = QVariant)
-    def getContainerProperty(self, container_id: str, setting_key: str, property_name: str):
-        containers = self._container_registry.findContainers(id = container_id)
-        if not containers:
-            Logger.log("w", "Could not get properties of container %s because it was not found.", container_id)
-            return ""
-        container = containers[0]
-
-        return container.getProperty(setting_key, property_name)
-
     @pyqtSlot(str, result = str)
     def makeUniqueName(self, original_name):
         return self._container_registry.uniqueName(original_name)

cura/TaskManagement/OnExitCallbackManager.py

@@ -0,0 +1,69 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from typing import TYPE_CHECKING, Callable, List
+
+from UM.Logger import Logger
+
+if TYPE_CHECKING:
+    from cura.CuraApplication import CuraApplication
+
+
+#
+# This class manages a all registered upon-exit checks that need to be perform when the application tries to exit.
+# For example, to show a confirmation dialog when there is USB printing in progress, etc. All callbacks will be called
+# in the order of when they got registered. If all callbacks "passes", that is, for example, if the user clicks "yes"
+# on the exit confirmation dialog or nothing that's blocking the exit, then the application will quit after that.
+#
+class OnExitCallbackManager:
+
+    def __init__(self, application: "CuraApplication") -> None:
+        self._application = application
+        self._on_exit_callback_list = list()  # type: List[Callable]
+        self._current_callback_idx = 0
+        self._is_all_checks_passed = False
+
+    def addCallback(self, callback: Callable) -> None:
+        self._on_exit_callback_list.append(callback)
+        Logger.log("d", "on-app-exit callback [%s] added.", callback)
+
+    # Reset the current state so the next time it will call all the callbacks again.
+    def resetCurrentState(self) -> None:
+        self._current_callback_idx = 0
+        self._is_all_checks_passed = False
+
+    def getIsAllChecksPassed(self) -> bool:
+        return self._is_all_checks_passed
+
+    # Trigger the next callback if available. If not, it means that all callbacks have "passed", which means we should
+    # not block the application to quit, and it will call the application to actually quit.
+    def triggerNextCallback(self) -> None:
+        # Get the next callback and schedule that if
+        this_callback = None
+        if self._current_callback_idx < len(self._on_exit_callback_list):
+            this_callback = self._on_exit_callback_list[self._current_callback_idx]
+            self._current_callback_idx += 1
+
+        if this_callback is not None:
+            Logger.log("d", "Scheduled the next on-app-exit callback [%s]", this_callback)
+            self._application.callLater(this_callback)
+        else:
+            Logger.log("d", "No more on-app-exit callbacks to process. Tell the app to exit.")
+
+            self._is_all_checks_passed = True
+
+            # Tell the application to exit
+            self._application.callLater(self._application.closeApplication)
+
+    # This is the callback function which an on-exit callback should call when it finishes, it should provide the
+    # "should_proceed" flag indicating whether this check has "passed", or in other words, whether quiting the
+    # application should be blocked. If the last on-exit callback doesn't block the quiting, it will call the next
+    # registered on-exit callback if available.
+    def onCurrentCallbackFinished(self, should_proceed: bool = True) -> None:
+        if not should_proceed:
+            Logger.log("d", "on-app-exit callback finished and we should not proceed.")
+            # Reset the state
+            self.resetCurrentState()
+            return
+
+        self.triggerNextCallback()

plugins/CuraEngineBackend/CuraEngineBackend.py

@@ -457,7 +457,8 @@ class CuraEngineBackend(QObject, Backend):
             # Only count sliceable objects
             if node.callDecoration("isSliceable"):
                 build_plate_number = node.callDecoration("getBuildPlateNumber")
-                num_objects[build_plate_number] += 1
+                if build_plate_number is not None:
+                    num_objects[build_plate_number] += 1
         return num_objects
 
     ##  Listener for when the scene has changed.
@@ -490,7 +491,9 @@ class CuraEngineBackend(QObject, Backend):
                 if mesh_data and mesh_data.getVertices() is None:
                     return
 
-            build_plate_changed.add(source_build_plate_number)
+            # There are some SceneNodes that do not have any build plate associated, then do not add to the list.
+            if source_build_plate_number is not None:
+                build_plate_changed.add(source_build_plate_number)
 
         if not build_plate_changed:
             return

plugins/USBPrinting/USBPrinterOutputDevice.py

@@ -88,6 +88,25 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
         self._command_received = Event()
         self._command_received.set()
 
+        CuraApplication.getInstance().getOnExitCallbackManager().addCallback(self._checkActivePrintingUponAppExit)
+
+    # This is a callback function that checks if there is any printing in progress via USB when the application tries
+    # to exit. If so, it will show a confirmation before
+    def _checkActivePrintingUponAppExit(self) -> None:
+        application = CuraApplication.getInstance()
+        if not self._is_printing:
+            # This USB printer is not printing, so we have nothing to do. Call the next callback if exists.
+            application.triggerNextExitCheck()
+            return
+
+        application.setConfirmExitDialogCallback(self._onConfirmExitDialogResult)
+        application.showConfirmExitDialog.emit(catalog.i18nc("@label", "A USB print is in progress, closing Cura will stop this print. Are you sure?"))
+
+    def _onConfirmExitDialogResult(self, result: bool) -> None:
+        if result:
+            application = CuraApplication.getInstance()
+            application.triggerNextExitCheck()
+
     ## Reset USB device settings
     #
     def resetDeviceSettings(self):
@@ -435,9 +454,6 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
 
         self._gcode_position += 1
 
-    def getIsPrinting(self)-> bool:
-        return self._is_printing
-
 
 class FirmwareUpdateState(IntEnum):
     idle = 0

plugins/USBPrinting/USBPrinterOutputDeviceManager.py

@@ -6,8 +6,7 @@ import platform
 import time
 import serial.tools.list_ports
 
-from PyQt5.QtCore import QObject, pyqtSlot, pyqtSignal, QCoreApplication
-from PyQt5.QtWidgets import QMessageBox
+from PyQt5.QtCore import QObject, pyqtSlot, pyqtProperty, pyqtSignal
 
 from UM.Logger import Logger
 from UM.Resources import Resources
@@ -51,11 +50,6 @@ class USBPrinterOutputDeviceManager(QObject, OutputDevicePlugin):
 
         self._application.globalContainerStackChanged.connect(self.updateUSBPrinterOutputDevices)
 
-        self._application.checkCuraCloseChange.connect(self.checkWheterUSBIsActiveOrNot)
-
-        self._lock = threading.Lock()
-        self._confirm_dialog_visible = False
-
     # The method updates/reset the USB settings for all connected USB devices
     def updateUSBPrinterOutputDevices(self):
         for key, device in self._usb_output_devices.items():
@@ -190,51 +184,3 @@ class USBPrinterOutputDeviceManager(QObject, OutputDevicePlugin):
     @classmethod
     def getInstance(cls, *args, **kwargs) -> "USBPrinterOutputDeviceManager":
         return cls.__instance
-
-    # The method checks whether a printer is printing via USB or not before closing cura. If the printer is printing then pop up a
-    # dialog to confirm stop printing
-    def checkWheterUSBIsActiveOrNot(self)-> None:
-
-        is_printing = False
-        for key, device in self._usb_output_devices.items():
-            if type(device) is USBPrinterOutputDevice.USBPrinterOutputDevice:
-                if device.getIsPrinting():
-                    is_printing = True
-                    break
-
-        if is_printing:
-            if threading.current_thread() != threading.main_thread():
-                self._lock.acquire()
-            self._confirm_dialog_visible = True
-
-            CuraApplication.getInstance().messageBox(i18n_catalog.i18nc("@window:title", "Confirm stop printing"),
-                                                     i18n_catalog.i18nc("@window:message","A USB print is in progress, closing Cura will stop this print. Are you sure?"),
-                                                     buttons=QMessageBox.Yes + QMessageBox.No,
-                                                     icon=QMessageBox.Question,
-                                                     callback=self._messageBoxCallback)
-            # Wait for dialog result
-            self.waitForClose()
-
-    ##  Block thread until the dialog is closed.
-    def waitForClose(self)-> None:
-        if self._confirm_dialog_visible:
-            if threading.current_thread() != threading.main_thread():
-                self._lock.acquire()
-                self._lock.release()
-            else:
-                # If this is not run from a separate thread, we need to ensure that the events are still processed.
-                while self._confirm_dialog_visible:
-                    time.sleep(1 / 50)
-                    QCoreApplication.processEvents()  # Ensure that the GUI does not freeze.
-
-    def _messageBoxCallback(self, button):
-        if button == QMessageBox.Yes:
-            self._application.setCuraCanBeClosed(True)
-        else:
-            self._application.setCuraCanBeClosed(False)
-
-        self._confirm_dialog_visible = False
-        try:
-            self._lock.release()
-        except:
-            pass

resources/definitions/prusa_i3.def.json

@@ -40,6 +40,14 @@
                 [18, -18]
             ]
         },
+        "machine_head_with_fans_polygon": {
+            "default_value": [
+                [-75, -18],
+                [-75, 35],
+                [18, 35],
+                [18, -18]
+            ]
+        },
         "gantry_height": {
             "default_value": 55
         },

resources/qml/Cura.qml

@@ -1,11 +1,11 @@
 // Copyright (c) 2017 Ultimaker B.V.
 // Cura is released under the terms of the LGPLv3 or higher.
 
-import QtQuick 2.2
-import QtQuick.Controls 1.1
-import QtQuick.Controls.Styles 1.1
+import QtQuick 2.7
+import QtQuick.Controls 1.4
+import QtQuick.Controls.Styles 1.4
 import QtQuick.Layouts 1.1
-import QtQuick.Dialogs 1.1
+import QtQuick.Dialogs 1.2
 
 import UM 1.3 as UM
 import Cura 1.0 as Cura
@@ -22,12 +22,6 @@ UM.MainWindow
 
     backgroundColor: UM.Theme.getColor("viewport_background")
 
-    // Event which does the check before closing the window
-    onPreCloseChange:
-    {
-        event.accepted = CuraApplication.preCloseEventHandler()
-    }
-
     // This connection is here to support legacy printer output devices that use the showPrintMonitor signal on Application to switch to the monitor stage
     // It should be phased out in newer plugin versions.
     Connections
@@ -120,31 +114,10 @@ UM.MainWindow
 
                 RecentFilesMenu { }
 
-                MenuSeparator { }
-
-                MenuItem
-                {
-                    text: catalog.i18nc("@action:inmenu menubar:file", "&Save Selection to File");
-                    enabled: UM.Selection.hasSelection;
-                    iconName: "document-save-as";
-                    onTriggered: UM.OutputDeviceManager.requestWriteSelectionToDevice("local_file", PrintInformation.jobName, { "filter_by_machine": false, "preferred_mimetype": "application/vnd.ms-package.3dmanufacturing-3dmodel+xml"});
-                }
-
-                MenuItem
-                {
-                    id: saveAsMenu
-                    text: catalog.i18nc("@title:menu menubar:file", "Save &As...")
-                    onTriggered:
-                    {
-                        var localDeviceId = "local_file";
-                        UM.OutputDeviceManager.requestWriteToDevice(localDeviceId, PrintInformation.jobName, { "filter_by_machine": false, "preferred_mimetype": "application/vnd.ms-package.3dmanufacturing-3dmodel+xml"});
-                    }
-                }
-
                 MenuItem
                 {
                     id: saveWorkspaceMenu
-                    text: catalog.i18nc("@title:menu menubar:file","Save &Project...")
+                    text: catalog.i18nc("@title:menu menubar:file","&Save...")
                     onTriggered:
                     {
                         var args = { "filter_by_machine": false, "file_type": "workspace", "preferred_mimetype": "application/x-curaproject+xml" };
@@ -160,6 +133,29 @@ UM.MainWindow
                     }
                 }
 
+                MenuSeparator { }
+
+                MenuItem
+                {
+                    id: saveAsMenu
+                    text: catalog.i18nc("@title:menu menubar:file", "&Export...")
+                    onTriggered:
+                    {
+                        var localDeviceId = "local_file";
+                        UM.OutputDeviceManager.requestWriteToDevice(localDeviceId, PrintInformation.jobName, { "filter_by_machine": false, "preferred_mimetype": "application/vnd.ms-package.3dmanufacturing-3dmodel+xml"});
+                    }
+                }
+
+                MenuItem
+                {
+                    text: catalog.i18nc("@action:inmenu menubar:file", "Export Selection...");
+                    enabled: UM.Selection.hasSelection;
+                    iconName: "document-save-as";
+                    onTriggered: UM.OutputDeviceManager.requestWriteSelectionToDevice("local_file", PrintInformation.jobName, { "filter_by_machine": false, "preferred_mimetype": "application/vnd.ms-package.3dmanufacturing-3dmodel+xml"});
+                }
+
+                MenuSeparator { }
+
                 MenuItem { action: Cura.Actions.reloadAll; }
 
                 MenuSeparator { }
@@ -704,10 +700,50 @@ UM.MainWindow
         id: contextMenu
     }
 
+    onPreClosing:
+    {
+        close.accepted = CuraApplication.getIsAllChecksPassed();
+        if (!close.accepted)
+        {
+            CuraApplication.checkAndExitApplication();
+        }
+    }
+
+    MessageDialog
+    {
+        id: exitConfirmationDialog
+        title: catalog.i18nc("@title:window", "Closing Cura")
+        text: catalog.i18nc("@label", "Are you sure you want to exit Cura?")
+        icon: StandardIcon.Question
+        modality: Qt.ApplicationModal
+        standardButtons: StandardButton.Yes | StandardButton.No
+        onYes: CuraApplication.callConfirmExitDialogCallback(true)
+        onNo: CuraApplication.callConfirmExitDialogCallback(false)
+        onRejected: CuraApplication.callConfirmExitDialogCallback(false)
+        onVisibilityChanged:
+        {
+            if (!visible)
+            {
+                // reset the text to default because other modules may change the message text.
+                text = catalog.i18nc("@label", "Are you sure you want to exit Cura?");
+            }
+        }
+    }
+
+    Connections
+    {
+        target: CuraApplication
+        onShowConfirmExitDialog:
+        {
+            exitConfirmationDialog.text = message;
+            exitConfirmationDialog.open();
+        }
+    }
+
     Connections
     {
         target: Cura.Actions.quit
-        onTriggered: CuraApplication.closeApplication();
+        onTriggered: CuraApplication.exitApplication();
     }
 
     Connections

resources/qml/JobSpecs.qml

@@ -81,7 +81,7 @@ Item {
                 text: PrintInformation.jobName
                 horizontalAlignment: TextInput.AlignRight
                 onEditingFinished: {
-                    var new_name = text == "" ? "unnamed" : text;
+                    var new_name = text == "" ? catalog.i18nc("@text Print job name", "unnamed") : text;
                     PrintInformation.setJobName(new_name, true);
                     printJobTextfield.focus = false;
                 }

resources/qml/Preferences/MaterialView.qml

@@ -103,7 +103,6 @@ TabView
 
                     onYes:
                     {
-                        Cura.ContainerManager.setContainerProperty(base.containerId, "material_diameter", "value", new_diameter_value);
                         base.setMetaDataEntry("approximate_diameter", old_approximate_diameter_value, getApproximateDiameter(new_diameter_value).toString());
                         base.setMetaDataEntry("properties/diameter", properties.diameter, new_diameter_value);
                     }
@@ -230,7 +229,7 @@ TabView
                     {
                         // This does not use a SettingPropertyProvider, because we need to make the change to all containers
                         // which derive from the same base_file
-                        var old_diameter = Cura.ContainerManager.getContainerProperty(base.containerId, "material_diameter", "value").toString();
+                        var old_diameter = Cura.ContainerManager.getContainerMetaDataEntry(base.containerId, "properties/diameter");
                         var old_approximate_diameter = Cura.ContainerManager.getContainerMetaDataEntry(base.containerId, "approximate_diameter");
                         var new_approximate_diameter = getApproximateDiameter(value);
                         if (new_approximate_diameter != Cura.ExtruderManager.getActiveExtruderStack().approximateMaterialDiameter)
@@ -242,7 +241,6 @@ TabView
                             confirmDiameterChangeDialog.open()
                         }
                         else {
-                            Cura.ContainerManager.setContainerProperty(base.containerId, "material_diameter", "value", value);
                             base.setMetaDataEntry("approximate_diameter", old_approximate_diameter, getApproximateDiameter(value).toString());
                             base.setMetaDataEntry("properties/diameter", properties.diameter, value);
                         }
@@ -271,7 +269,7 @@ TabView
                 {
                     id: spoolWeightSpinBox
                     width: scrollView.columnWidth
-                    value: base.getMaterialPreferenceValue(properties.guid, "spool_weight")
+                    value: base.getMaterialPreferenceValue(properties.guid, "spool_weight", Cura.ContainerManager.getContainerMetaDataEntry(properties.container_id, "properties/weight"))
                     suffix: " g"
                     stepSize: 100
                     decimals: 0
@@ -468,7 +466,7 @@ TabView
         }
         if(!spoolWeight)
         {
-            spoolWeight = base.getMaterialPreferenceValue(properties.guid, "spool_weight");
+            spoolWeight = base.getMaterialPreferenceValue(properties.guid, "spool_weight", Cura.ContainerManager.getContainerMetaDataEntry(properties.container_id, "properties/weight"));
         }
 
         if (diameter == 0 || density == 0 || spoolWeight == 0)
@@ -517,21 +515,34 @@ TabView
             // value has not changed
             return;
         }
-        materialPreferenceValues[material_guid][entry_name] = new_value;
+        if (entry_name in materialPreferenceValues[material_guid] && new_value.toString() == 0)
+        {
+            // no need to store a 0, that's the default, so remove it
+            materialPreferenceValues[material_guid].delete(entry_name);
+            if (!(materialPreferenceValues[material_guid]))
+            {
+                // remove empty map
+                materialPreferenceValues.delete(material_guid);
+            }
+        }
+        if (new_value.toString() != 0)
+        {
+            // store new value
+            materialPreferenceValues[material_guid][entry_name] = new_value;
+        }
 
         // store preference
         UM.Preferences.setValue("cura/material_settings", JSON.stringify(materialPreferenceValues));
     }
 
-    function getMaterialPreferenceValue(material_guid, entry_name)
+    function getMaterialPreferenceValue(material_guid, entry_name, default_value)
     {
         if(material_guid in materialPreferenceValues && entry_name in materialPreferenceValues[material_guid])
         {
             return materialPreferenceValues[material_guid][entry_name];
         }
-
-        var material_weight = Cura.ContainerManager.getContainerMetaDataEntry(base.containerId, "properties", "weight");
-        return material_weight || 0;
+        default_value = default_value | 0;
+        return default_value;
     }
 
     // update the display name of the material

resources/qml/Preferences/MaterialsPage.qml

@@ -486,6 +486,7 @@ Item
 
                 materialProperties.name = currentItem.name ? currentItem.name : "Unknown";
                 materialProperties.guid = currentItem.guid;
+                materialProperties.container_id = currentItem.container_id;
 
                 materialProperties.brand = currentItem.brand ? currentItem.brand : "Unknown";
                 materialProperties.material = currentItem.material ? currentItem.material : "Unknown";
@@ -543,6 +544,7 @@ Item
                     id: materialProperties
 
                     property string guid: "00000000-0000-0000-0000-000000000000"
+                    property string container_id: "Unknown";
                     property string name: "Unknown";
                     property string profile_type: "Unknown";
                     property string brand: "Unknown";