Merge pull request #3144 from fieldOfView/feature_preheat_extruder

Feature preheat extruder

cura/PrinterOutput/ExtruderOutputModel.py

@@ -18,6 +18,7 @@ class ExtruderOutputModel(QObject):
     hotendTemperatureChanged = pyqtSignal()
     activeMaterialChanged = pyqtSignal()
     extruderConfigurationChanged = pyqtSignal()
+    isPreheatingChanged = pyqtSignal()
 
     def __init__(self, printer: "PrinterOutputModel", position, parent=None):
         super().__init__(parent)
@@ -30,6 +31,21 @@ class ExtruderOutputModel(QObject):
         self._extruder_configuration = ExtruderConfigurationModel()
         self._extruder_configuration.position = self._position
 
+        self._is_preheating = False
+
+    def getPrinter(self):
+        return self._printer
+
+    def getPosition(self):
+        return self._position
+
+    # Does the printer support pre-heating the bed at all
+    @pyqtProperty(bool, constant=True)
+    def canPreHeatHotends(self):
+        if self._printer:
+            return self._printer.canPreHeatHotends
+        return False
+
     @pyqtProperty(QObject, notify = activeMaterialChanged)
     def activeMaterial(self) -> "MaterialOutputModel":
         return self._active_material
@@ -82,3 +98,25 @@ class ExtruderOutputModel(QObject):
         if self._extruder_configuration.isValid():
             return self._extruder_configuration
         return None
+
+    def updateIsPreheating(self, pre_heating):
+        if self._is_preheating != pre_heating:
+            self._is_preheating = pre_heating
+            self.isPreheatingChanged.emit()
+
+    @pyqtProperty(bool, notify=isPreheatingChanged)
+    def isPreheating(self):
+        return self._is_preheating
+
+    ##  Pre-heats the extruder before printer.
+    #
+    #   \param temperature The temperature to heat the extruder to, in degrees
+    #   Celsius.
+    #   \param duration How long the bed should stay warm, in seconds.
+    @pyqtSlot(float, float)
+    def preheatHotend(self, temperature, duration):
+        self._printer._controller.preheatHotend(self, temperature, duration)
+
+    @pyqtSlot()
+    def cancelPreheatHotend(self):
+        self._printer._controller.cancelPreheatHotend(self)

cura/PrinterOutput/GenericOutputController.py

@@ -0,0 +1,151 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from cura.PrinterOutput.PrinterOutputController import PrinterOutputController
+from PyQt5.QtCore import QTimer
+
+MYPY = False
+if MYPY:
+    from cura.PrinterOutput.PrintJobOutputModel import PrintJobOutputModel
+    from cura.PrinterOutput.PrinterOutputModel import PrinterOutputModel
+
+
+class GenericOutputController(PrinterOutputController):
+    def __init__(self, output_device):
+        super().__init__(output_device)
+
+        self._preheat_bed_timer = QTimer()
+        self._preheat_bed_timer.setSingleShot(True)
+        self._preheat_bed_timer.timeout.connect(self._onPreheatBedTimerFinished)
+        self._preheat_printer = None
+
+        self._preheat_hotends_timer = QTimer()
+        self._preheat_hotends_timer.setSingleShot(True)
+        self._preheat_hotends_timer.timeout.connect(self._onPreheatHotendsTimerFinished)
+        self._preheat_hotends = set()
+
+        self._output_device.printersChanged.connect(self._onPrintersChanged)
+        self._active_printer = None
+
+    def _onPrintersChanged(self):
+        if self._active_printer:
+            self._active_printer.stateChanged.disconnect(self._onPrinterStateChanged)
+            self._active_printer.targetBedTemperatureChanged.disconnect(self._onTargetBedTemperatureChanged)
+            for extruder in self._active_printer.extruders:
+                extruder.targetHotendTemperatureChanged.disconnect(self._onTargetHotendTemperatureChanged)
+
+        self._active_printer = self._output_device.activePrinter
+        if self._active_printer:
+            self._active_printer.stateChanged.connect(self._onPrinterStateChanged)
+            self._active_printer.targetBedTemperatureChanged.connect(self._onTargetBedTemperatureChanged)
+            for extruder in self._active_printer.extruders:
+                extruder.targetHotendTemperatureChanged.connect(self._onTargetHotendTemperatureChanged)
+
+    def _onPrinterStateChanged(self):
+        if self._active_printer.state != "idle":
+            if self._preheat_bed_timer.isActive():
+                self._preheat_bed_timer.stop()
+                self._preheat_printer.updateIsPreheating(False)
+            if self._preheat_hotends_timer.isActive():
+                self._preheat_hotends_timer.stop()
+                for extruder in self._preheat_hotends:
+                    extruder.updateIsPreheating(False)
+                self._preheat_hotends = set()
+
+    def moveHead(self, printer: "PrinterOutputModel", x, y, z, speed):
+        self._output_device.sendCommand("G91")
+        self._output_device.sendCommand("G0 X%s Y%s Z%s F%s" % (x, y, z, speed))
+        self._output_device.sendCommand("G90")
+
+    def homeHead(self, printer):
+        self._output_device.sendCommand("G28 X")
+        self._output_device.sendCommand("G28 Y")
+
+    def homeBed(self, printer):
+        self._output_device.sendCommand("G28 Z")
+
+    def setJobState(self, job: "PrintJobOutputModel", state: str):
+        if state == "pause":
+            self._output_device.pausePrint()
+            job.updateState("paused")
+        elif state == "print":
+            self._output_device.resumePrint()
+            job.updateState("printing")
+        elif state == "abort":
+            self._output_device.cancelPrint()
+            pass
+
+    def setTargetBedTemperature(self, printer: "PrinterOutputModel", temperature: int):
+        self._output_device.sendCommand("M140 S%s" % temperature)
+
+    def _onTargetBedTemperatureChanged(self):
+        if self._preheat_bed_timer.isActive() and self._preheat_printer.targetBedTemperature == 0:
+            self._preheat_bed_timer.stop()
+            self._preheat_printer.updateIsPreheating(False)
+
+    def preheatBed(self, printer: "PrinterOutputModel", temperature, duration):
+        try:
+            temperature = round(temperature)  # The API doesn't allow floating point.
+            duration = round(duration)
+        except ValueError:
+            return  # Got invalid values, can't pre-heat.
+
+        self.setTargetBedTemperature(printer, temperature=temperature)
+        self._preheat_bed_timer.setInterval(duration * 1000)
+        self._preheat_bed_timer.start()
+        self._preheat_printer = printer
+        printer.updateIsPreheating(True)
+
+    def cancelPreheatBed(self, printer: "PrinterOutputModel"):
+        self.setTargetBedTemperature(printer, temperature=0)
+        self._preheat_bed_timer.stop()
+        printer.updateIsPreheating(False)
+
+    def _onPreheatBedTimerFinished(self):
+        self.setTargetBedTemperature(self._preheat_printer, 0)
+        self._preheat_printer.updateIsPreheating(False)
+
+    def setTargetHotendTemperature(self, printer: "PrinterOutputModel", position: int, temperature: int):
+        self._output_device.sendCommand("M104 S%s T%s" % (temperature, position))
+
+    def _onTargetHotendTemperatureChanged(self):
+        if not self._preheat_hotends_timer.isActive():
+            return
+
+        for extruder in self._active_printer.extruders:
+            if extruder in self._preheat_hotends and extruder.targetHotendTemperature == 0:
+                extruder.updateIsPreheating(False)
+                self._preheat_hotends.remove(extruder)
+        if not self._preheat_hotends:
+            self._preheat_hotends_timer.stop()
+
+    def preheatHotend(self, extruder: "ExtruderOutputModel", temperature, duration):
+        position = extruder.getPosition()
+        number_of_extruders = len(extruder.getPrinter().extruders)
+        if position >= number_of_extruders:
+            return  # Got invalid extruder nr, can't pre-heat.
+
+        try:
+            temperature = round(temperature)  # The API doesn't allow floating point.
+            duration = round(duration)
+        except ValueError:
+            return  # Got invalid values, can't pre-heat.
+
+        self.setTargetHotendTemperature(extruder.getPrinter(), position, temperature=temperature)
+        self._preheat_hotends_timer.setInterval(duration * 1000)
+        self._preheat_hotends_timer.start()
+        self._preheat_hotends.add(extruder)
+        extruder.updateIsPreheating(True)
+
+    def cancelPreheatHotend(self, extruder: "ExtruderOutputModel"):
+        self.setTargetHotendTemperature(extruder.getPrinter(), extruder.getPosition(), temperature=0)
+        if extruder in self._preheat_hotends:
+            extruder.updateIsPreheating(False)
+            self._preheat_hotends.remove(extruder)
+        if not self._preheat_hotends and self._preheat_hotends_timer.isActive():
+            self._preheat_hotends_timer.stop()
+
+    def _onPreheatHotendsTimerFinished(self):
+        for extruder in self._preheat_hotends:
+            self.setTargetHotendTemperature(extruder.getPrinter(), extruder.getPosition(), 0)
+        self._preheat_hotends = set()

cura/PrinterOutput/PrinterOutputController.py

@@ -15,6 +15,7 @@ class PrinterOutputController:
         self.can_pause = True
         self.can_abort = True
         self.can_pre_heat_bed = True
+        self.can_pre_heat_hotends = True
         self.can_control_manually = True
         self._output_device = output_device
 
@@ -33,6 +34,12 @@ class PrinterOutputController:
     def preheatBed(self, printer: "PrinterOutputModel", temperature, duration):
         Logger.log("w", "Preheat bed not implemented in controller")
 
+    def cancelPreheatHotend(self, extruder: "ExtruderOutputModel"):
+        Logger.log("w", "Cancel preheat hotend not implemented in controller")
+
+    def preheatHotend(self, extruder: "ExtruderOutputModel", temperature, duration):
+        Logger.log("w", "Preheat hotend not implemented in controller")
+
     def setHeadPosition(self, printer: "PrinterOutputModel", x, y, z, speed):
         Logger.log("w", "Set head position not implemented in controller")
 

cura/PrinterOutput/PrinterOutputModel.py

@@ -238,6 +238,13 @@ class PrinterOutputModel(QObject):
             return self._controller.can_pre_heat_bed
         return False
 
+    # Does the printer support pre-heating the bed at all
+    @pyqtProperty(bool, constant=True)
+    def canPreHeatHotends(self):
+        if self._controller:
+            return self._controller.can_pre_heat_hotends
+        return False
+
     # Does the printer support pause at all
     @pyqtProperty(bool, constant=True)
     def canPause(self):

plugins/UM3NetworkPrinting/ClusterUM3PrinterOutputController.py

@@ -13,6 +13,7 @@ class ClusterUM3PrinterOutputController(PrinterOutputController):
     def __init__(self, output_device):
         super().__init__(output_device)
         self.can_pre_heat_bed = False
+        self.can_pre_heat_hotends = False
         self.can_control_manually = False
 
     def setJobState(self, job: "PrintJobOutputModel", state: str):

plugins/USBPrinting/USBPrinterOutputController.py

@@ -1,68 +0,0 @@
-# Copyright (c) 2017 Ultimaker B.V.
-# Cura is released under the terms of the LGPLv3 or higher.
-
-from cura.PrinterOutput.PrinterOutputController import PrinterOutputController
-from PyQt5.QtCore import QTimer
-
-MYPY = False
-if MYPY:
-    from cura.PrinterOutput.PrintJobOutputModel import PrintJobOutputModel
-    from cura.PrinterOutput.PrinterOutputModel import PrinterOutputModel
-
-
-class USBPrinterOutputController(PrinterOutputController):
-    def __init__(self, output_device):
-        super().__init__(output_device)
-
-        self._preheat_bed_timer = QTimer()
-        self._preheat_bed_timer.setSingleShot(True)
-        self._preheat_bed_timer.timeout.connect(self._onPreheatBedTimerFinished)
-        self._preheat_printer = None
-
-    def moveHead(self, printer: "PrinterOutputModel", x, y, z, speed):
-        self._output_device.sendCommand("G91")
-        self._output_device.sendCommand("G0 X%s Y%s Z%s F%s" % (x, y, z, speed))
-        self._output_device.sendCommand("G90")
-
-    def homeHead(self, printer):
-        self._output_device.sendCommand("G28 X")
-        self._output_device.sendCommand("G28 Y")
-
-    def homeBed(self, printer):
-        self._output_device.sendCommand("G28 Z")
-
-    def setJobState(self, job: "PrintJobOutputModel", state: str):
-        if state == "pause":
-            self._output_device.pausePrint()
-            job.updateState("paused")
-        elif state == "print":
-            self._output_device.resumePrint()
-            job.updateState("printing")
-        elif state == "abort":
-            self._output_device.cancelPrint()
-            pass
-
-    def preheatBed(self, printer: "PrinterOutputModel", temperature, duration):
-        try:
-            temperature = round(temperature)  # The API doesn't allow floating point.
-            duration = round(duration)
-        except ValueError:
-            return  # Got invalid values, can't pre-heat.
-
-        self.setTargetBedTemperature(printer, temperature=temperature)
-        self._preheat_bed_timer.setInterval(duration * 1000)
-        self._preheat_bed_timer.start()
-        self._preheat_printer = printer
-        printer.updateIsPreheating(True)
-
-    def cancelPreheatBed(self, printer: "PrinterOutputModel"):
-        self.preheatBed(printer, temperature=0, duration=0)
-        self._preheat_bed_timer.stop()
-        printer.updateIsPreheating(False)
-
-    def setTargetBedTemperature(self, printer: "PrinterOutputModel", temperature: int):
-        self._output_device.sendCommand("M140 S%s" % temperature)
-
-    def _onPreheatBedTimerFinished(self):
-        self.setTargetBedTemperature(self._preheat_printer, 0)
-        self._preheat_printer.updateIsPreheating(False)

plugins/USBPrinting/USBPrinterOutputDevice.py

@@ -10,9 +10,9 @@ from UM.PluginRegistry import PluginRegistry
 from cura.PrinterOutputDevice import PrinterOutputDevice, ConnectionState
 from cura.PrinterOutput.PrinterOutputModel import PrinterOutputModel
 from cura.PrinterOutput.PrintJobOutputModel import PrintJobOutputModel
+from cura.PrinterOutput.GenericOutputController import GenericOutputController
 
 from .AutoDetectBaudJob import AutoDetectBaudJob
-from .USBPrinterOutputController import USBPrinterOutputController
 from .avr_isp import stk500v2, intelHex
 
 from PyQt5.QtCore import pyqtSlot, pyqtSignal, pyqtProperty
@@ -240,7 +240,7 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
         container_stack = Application.getInstance().getGlobalContainerStack()
         num_extruders = container_stack.getProperty("machine_extruder_count", "value")
         # Ensure that a printer is created.
-        self._printers = [PrinterOutputModel(output_controller=USBPrinterOutputController(self), number_of_extruders=num_extruders)]
+        self._printers = [PrinterOutputModel(output_controller=GenericOutputController(self), number_of_extruders=num_extruders)]
         self._printers[0].updateName(container_stack.getName())
         self.setConnectionState(ConnectionState.connected)
         self._update_thread.start()
@@ -372,7 +372,7 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
         elapsed_time = int(time() - self._print_start_time)
         print_job = self._printers[0].activePrintJob
         if print_job is None:
-            print_job = PrintJobOutputModel(output_controller = USBPrinterOutputController(self), name= Application.getInstance().getPrintInformation().jobName)
+            print_job = PrintJobOutputModel(output_controller = GenericOutputController(self), name= Application.getInstance().getPrintInformation().jobName)
             print_job.updateState("printing")
             self._printers[0].updateActivePrintJob(print_job)
 

resources/qml/PrinterOutput/ExtruderBox.qml

@@ -12,9 +12,20 @@ Item
     property alias color: background.color
     property var extruderModel
     property var position: index
-    //width: index == machineExtruderCount.properties.value - 1 && index % 2 == 0 ? extrudersGrid.width : Math.floor(extrudersGrid.width / 2 - UM.Theme.getSize("sidebar_lining_thin").width / 2)
     implicitWidth: parent.width
     implicitHeight: UM.Theme.getSize("sidebar_extruder_box").height
+
+    UM.SettingPropertyProvider
+    {
+        id: extruderTemperature
+        containerStackId: Cura.ExtruderManager.extruderIds[position]
+        key: "material_print_temperature"
+        watchedProperties: ["value", "minimum_value", "maximum_value", "resolve"]
+        storeIndex: 0
+
+        property var resolve: Cura.MachineManager.activeStackId != Cura.MachineManager.activeMachineId ? properties.resolve : "None"
+    }
+
     Rectangle
     {
         id: background
@@ -34,12 +45,11 @@ Item
         {
             id: extruderTargetTemperature
             text: Math.round(extruderModel.targetHotendTemperature) + "°C"
-            //text: (connectedPrinter != null && connectedPrinter.hotendIds[index] != null && connectedPrinter.targetHotendTemperatures[index] != null) ? Math.round(connectedPrinter.targetHotendTemperatures[index]) + "°C" : ""
             font: UM.Theme.getFont("small")
             color: UM.Theme.getColor("text_inactive")
             anchors.right: parent.right
             anchors.rightMargin: UM.Theme.getSize("default_margin").width
-            anchors.bottom: extruderTemperature.bottom
+            anchors.bottom: extruderCurrentTemperature.bottom
 
             MouseArea //For tooltip.
             {
@@ -52,7 +62,7 @@ Item
                     {
                         base.showTooltip(
                             base,
-                            {x: 0, y: extruderTargetTemperature.mapToItem(base, 0, -parent.height / 4).y},
+                            {x: 0, y: extruderTargetTemperature.mapToItem(base, 0, Math.floor(-parent.height / 4)).y},
                             catalog.i18nc("@tooltip", "The target temperature of the hotend. The hotend will heat up or cool down towards this temperature. If this is 0, the hotend heating is turned off.")
                         );
                     }
@@ -65,9 +75,8 @@ Item
         }
         Label //Temperature indication.
         {
-            id: extruderTemperature
+            id: extruderCurrentTemperature
             text: Math.round(extruderModel.hotendTemperature) + "°C"
-            //text: (connectedPrinter != null && connectedPrinter.hotendIds[index] != null && connectedPrinter.hotendTemperatures[index] != null) ? Math.round(connectedPrinter.hotendTemperatures[index]) + "°C" : ""
             color: UM.Theme.getColor("text")
             font: UM.Theme.getFont("large")
             anchors.right: extruderTargetTemperature.left
@@ -76,7 +85,7 @@ Item
 
             MouseArea //For tooltip.
             {
-                id: extruderTemperatureTooltipArea
+                id: extruderCurrentTemperatureTooltipArea
                 hoverEnabled: true
                 anchors.fill: parent
                 onHoveredChanged:
@@ -85,8 +94,8 @@ Item
                     {
                         base.showTooltip(
                             base,
-                            {x: 0, y: parent.mapToItem(base, 0, -parent.height / 4).y},
-                            catalog.i18nc("@tooltip", "The current temperature of this extruder.")
+                            {x: 0, y: parent.mapToItem(base, 0, Math.floor(-parent.height / 4)).y},
+                            catalog.i18nc("@tooltip", "The current temperature of this hotend.")
                         );
                     }
                     else
@@ -97,6 +106,272 @@ Item
             }
         }
 
+        Rectangle //Input field for pre-heat temperature.
+        {
+            id: preheatTemperatureControl
+            color: !enabled ? UM.Theme.getColor("setting_control_disabled") : showError ? UM.Theme.getColor("setting_validation_error_background") : UM.Theme.getColor("setting_validation_ok")
+            property var showError:
+            {
+                if(extruderTemperature.properties.maximum_value != "None" && extruderTemperature.properties.maximum_value <  Math.floor(preheatTemperatureInput.text))
+                {
+                    return true;
+                } else
+                {
+                    return false;
+                }
+            }
+            enabled:
+            {
+                if (extruderModel == null)
+                {
+                    return false; //Can't preheat if not connected.
+                }
+                if (!connectedPrinter.acceptsCommands)
+                {
+                    return false; //Not allowed to do anything.
+                }
+                if (connectedPrinter.activePrinter && connectedPrinter.activePrinter.activePrintJob)
+                {
+                    if((["printing", "pre_print", "resuming", "pausing", "paused", "error", "offline"]).indexOf(connectedPrinter.activePrinter.activePrintJob.state) != -1)
+                    {
+                        return false; //Printer is in a state where it can't react to pre-heating.
+                    }
+                }
+                return true;
+            }
+            border.width: UM.Theme.getSize("default_lining").width
+            border.color: !enabled ? UM.Theme.getColor("setting_control_disabled_border") : preheatTemperatureInputMouseArea.containsMouse ? UM.Theme.getColor("setting_control_border_highlight") : UM.Theme.getColor("setting_control_border")
+            anchors.right: preheatButton.left
+            anchors.rightMargin: UM.Theme.getSize("default_margin").width
+            anchors.bottom: parent.bottom
+            anchors.bottomMargin: UM.Theme.getSize("default_margin").height
+            width: UM.Theme.getSize("monitor_preheat_temperature_control").width
+            height: UM.Theme.getSize("monitor_preheat_temperature_control").height
+            visible: extruderModel != null ? enabled && extruderModel.canPreHeatHotends && !extruderModel.isPreheating : true
+            Rectangle //Highlight of input field.
+            {
+                anchors.fill: parent
+                anchors.margins: UM.Theme.getSize("default_lining").width
+                color: UM.Theme.getColor("setting_control_highlight")
+                opacity: preheatTemperatureControl.hovered ? 1.0 : 0
+            }
+            MouseArea //Change cursor on hovering.
+            {
+                id: preheatTemperatureInputMouseArea
+                hoverEnabled: true
+                anchors.fill: parent
+                cursorShape: Qt.IBeamCursor
+
+                onHoveredChanged:
+                {
+                    if (containsMouse)
+                    {
+                        base.showTooltip(
+                            base,
+                            {x: 0, y: preheatTemperatureInputMouseArea.mapToItem(base, 0, 0).y},
+                            catalog.i18nc("@tooltip of temperature input", "The temperature to pre-heat the hotend to.")
+                        );
+                    }
+                    else
+                    {
+                        base.hideTooltip();
+                    }
+                }
+            }
+            Label
+            {
+                id: unit
+                anchors.right: parent.right
+                anchors.rightMargin: UM.Theme.getSize("setting_unit_margin").width
+                anchors.verticalCenter: parent.verticalCenter
+
+                text: "°C";
+                color: UM.Theme.getColor("setting_unit")
+                font: UM.Theme.getFont("default")
+            }
+            TextInput
+            {
+                id: preheatTemperatureInput
+                font: UM.Theme.getFont("default")
+                color: !enabled ? UM.Theme.getColor("setting_control_disabled_text") : UM.Theme.getColor("setting_control_text")
+                selectByMouse: true
+                maximumLength: 5
+                enabled: parent.enabled
+                validator: RegExpValidator { regExp: /^-?[0-9]{0,9}[.,]?[0-9]{0,10}$/ } //Floating point regex.
+                anchors.left: parent.left
+                anchors.leftMargin: UM.Theme.getSize("setting_unit_margin").width
+                anchors.right: unit.left
+                anchors.verticalCenter: parent.verticalCenter
+                renderType: Text.NativeRendering
+
+                Component.onCompleted:
+                {
+                    if (!extruderTemperature.properties.value)
+                    {
+                        text = "";
+                    }
+                    else
+                    {
+                        text = extruderTemperature.properties.value;
+                    }
+                }
+            }
+        }
+
+        Button //The pre-heat button.
+        {
+            id: preheatButton
+            height: UM.Theme.getSize("setting_control").height
+            visible: extruderModel != null ? extruderModel.canPreHeatHotends: true
+            enabled:
+            {
+                if (!preheatTemperatureControl.enabled)
+                {
+                    return false; //Not connected, not authenticated or printer is busy.
+                }
+                if (extruderModel.isPreheating)
+                {
+                    return true;
+                }
+                if (extruderTemperature.properties.minimum_value != "None" && Math.floor(preheatTemperatureInput.text) < Math.floor(extruderTemperature.properties.minimum_value))
+                {
+                    return false; //Target temperature too low.
+                }
+                if (extruderTemperature.properties.maximum_value != "None" && Math.floor(preheatTemperatureInput.text) > Math.floor(extruderTemperature.properties.maximum_value))
+                {
+                    return false; //Target temperature too high.
+                }
+                if (Math.floor(preheatTemperatureInput.text) == 0)
+                {
+                    return false; //Setting the temperature to 0 is not allowed (since that cancels the pre-heating).
+                }
+                return true; //Preconditions are met.
+            }
+            anchors.right: parent.right
+            anchors.bottom: parent.bottom
+            anchors.margins: UM.Theme.getSize("default_margin").width
+            style: ButtonStyle {
+                background: Rectangle
+                {
+                    border.width: UM.Theme.getSize("default_lining").width
+                    implicitWidth: actualLabel.contentWidth + (UM.Theme.getSize("default_margin").width * 2)
+                    border.color:
+                    {
+                        if(!control.enabled)
+                        {
+                            return UM.Theme.getColor("action_button_disabled_border");
+                        }
+                        else if(control.pressed)
+                        {
+                            return UM.Theme.getColor("action_button_active_border");
+                        }
+                        else if(control.hovered)
+                        {
+                            return UM.Theme.getColor("action_button_hovered_border");
+                        }
+                        else
+                        {
+                            return UM.Theme.getColor("action_button_border");
+                        }
+                    }
+                    color:
+                    {
+                        if(!control.enabled)
+                        {
+                            return UM.Theme.getColor("action_button_disabled");
+                        }
+                        else if(control.pressed)
+                        {
+                            return UM.Theme.getColor("action_button_active");
+                        }
+                        else if(control.hovered)
+                        {
+                            return UM.Theme.getColor("action_button_hovered");
+                        }
+                        else
+                        {
+                            return UM.Theme.getColor("action_button");
+                        }
+                    }
+                    Behavior on color
+                    {
+                        ColorAnimation
+                        {
+                            duration: 50
+                        }
+                    }
+
+                    Label
+                    {
+                        id: actualLabel
+                        anchors.centerIn: parent
+                        color:
+                        {
+                            if(!control.enabled)
+                            {
+                                return UM.Theme.getColor("action_button_disabled_text");
+                            }
+                            else if(control.pressed)
+                            {
+                                return UM.Theme.getColor("action_button_active_text");
+                            }
+                            else if(control.hovered)
+                            {
+                                return UM.Theme.getColor("action_button_hovered_text");
+                            }
+                            else
+                            {
+                                return UM.Theme.getColor("action_button_text");
+                            }
+                        }
+                        font: UM.Theme.getFont("action_button")
+                        text:
+                        {
+                            if(extruderModel == null)
+                            {
+                                return ""
+                            }
+                            if(extruderModel.isPreheating )
+                            {
+                                return catalog.i18nc("@button Cancel pre-heating", "Cancel")
+                            } else
+                            {
+                                return catalog.i18nc("@button", "Pre-heat")
+                            }
+                        }
+                    }
+                }
+            }
+
+            onClicked:
+            {
+                if (!extruderModel.isPreheating)
+                {
+                    extruderModel.preheatHotend(preheatTemperatureInput.text, 900);
+                }
+                else
+                {
+                    extruderModel.cancelPreheatHotend();
+                }
+            }
+
+            onHoveredChanged:
+            {
+                if (hovered)
+                {
+                    base.showTooltip(
+                        base,
+                        {x: 0, y: preheatButton.mapToItem(base, 0, 0).y},
+                        catalog.i18nc("@tooltip of pre-heat", "Heat the hotend in advance before printing. You can continue adjusting your print while it is heating, and you won't have to wait for the hotend to heat up when you're ready to print.")
+                    );
+                }
+                else
+                {
+                    base.hideTooltip();
+                }
+            }
+        }
+
         Rectangle //Material colour indication.
         {
             id: materialColor

resources/qml/PrinterOutput/HeatedBedBox.qml

@@ -114,21 +114,24 @@ Item
                 {
                     return false; //Not allowed to do anything.
                 }
-                if (connectedPrinter.jobState == "printing" || connectedPrinter.jobState == "pre_print" || connectedPrinter.jobState == "resuming" || connectedPrinter.jobState == "pausing" || connectedPrinter.jobState == "paused" || connectedPrinter.jobState == "error" || connectedPrinter.jobState == "offline")
+                if (connectedPrinter.activePrinter && connectedPrinter.activePrinter.activePrintJob)
                 {
-                    return false; //Printer is in a state where it can't react to pre-heating.
+                    if((["printing", "pre_print", "resuming", "pausing", "paused", "error", "offline"]).indexOf(connectedPrinter.activePrinter.activePrintJob.state) != -1)
+                    {
+                        return false; //Printer is in a state where it can't react to pre-heating.
+                    }
                 }
                 return true;
             }
             border.width: UM.Theme.getSize("default_lining").width
             border.color: !enabled ? UM.Theme.getColor("setting_control_disabled_border") : preheatTemperatureInputMouseArea.containsMouse ? UM.Theme.getColor("setting_control_border_highlight") : UM.Theme.getColor("setting_control_border")
-            anchors.left: parent.left
-            anchors.leftMargin: UM.Theme.getSize("default_margin").width
+            anchors.right: preheatButton.left
+            anchors.rightMargin: UM.Theme.getSize("default_margin").width
             anchors.bottom: parent.bottom
             anchors.bottomMargin: UM.Theme.getSize("default_margin").height
-            width: UM.Theme.getSize("setting_control").width
-            height: UM.Theme.getSize("setting_control").height
-            visible: printerModel != null ? printerModel.canPreHeatBed: true
+            width: UM.Theme.getSize("monitor_preheat_temperature_control").width
+            height: UM.Theme.getSize("monitor_preheat_temperature_control").height
+            visible: printerModel != null ? enabled && printerModel.canPreHeatBed && !printerModel.isPreheating : true
             Rectangle //Highlight of input field.
             {
                 anchors.fill: parent
@@ -159,18 +162,29 @@ Item
                     }
                 }
             }
+            Label
+            {
+                id: unit
+                anchors.right: parent.right
+                anchors.rightMargin: UM.Theme.getSize("setting_unit_margin").width
+                anchors.verticalCenter: parent.verticalCenter
+
+                text: "°C";
+                color: UM.Theme.getColor("setting_unit")
+                font: UM.Theme.getFont("default")
+            }
             TextInput
             {
                 id: preheatTemperatureInput
                 font: UM.Theme.getFont("default")
                 color: !enabled ? UM.Theme.getColor("setting_control_disabled_text") : UM.Theme.getColor("setting_control_text")
                 selectByMouse: true
-                maximumLength: 10
+                maximumLength: 5
                 enabled: parent.enabled
                 validator: RegExpValidator { regExp: /^-?[0-9]{0,9}[.,]?[0-9]{0,10}$/ } //Floating point regex.
                 anchors.left: parent.left
                 anchors.leftMargin: UM.Theme.getSize("setting_unit_margin").width
-                anchors.right: parent.right
+                anchors.right: unit.left
                 anchors.verticalCenter: parent.verticalCenter
                 renderType: Text.NativeRendering
 

resources/themes/cura-light/theme.json

@@ -411,6 +411,8 @@
         "save_button_save_to_button": [0.3, 2.7],
         "save_button_specs_icons": [1.4, 1.4],
 
+        "monitor_preheat_temperature_control": [4.5, 2.0],
+
         "modal_window_minimum": [60.0, 45],
         "license_window_minimum": [45, 45],
         "wizard_progress": [10.0, 0.0],