diff --git a/plugins/USBPrinting/USBPrinterManager.py b/plugins/USBPrinting/USBPrinterManager.py
index 3a2beab0c8..fcb61c3365 100644
--- a/plugins/USBPrinting/USBPrinterManager.py
+++ b/plugins/USBPrinting/USBPrinterManager.py
@@ -135,35 +135,44 @@ class USBPrinterManager(QObject, SignalEmitter, OutputDevicePlugin, Extension):
     def _getDefaultFirmwareName(self):
         machine_instance = Application.getInstance().getMachineManager().getActiveMachineInstance()
         machine_type = machine_instance.getMachineDefinition().getId()
-        baudrate = 250000
-        if sys.platform.startswith("linux"):
-                baudrate = 115200
-        if machine_type == "ultimaker_original":
-            firmware_name = "MarlinUltimaker"
-            if machine_instance.getMachineSettingValue("machine_heated_bed"): #Has heated bed upgrade kit?
-                firmware_name += "-HBK"
-            firmware_name += "-%d" % (baudrate)
-            return firmware_name + ".hex"
-        elif machine_type == "ultimaker_original_plus":
-            firmware_name = "MarlinUltimaker-UMOP-%d" % (baudrate)
-            return firmware_name + ".hex"
-        elif machine_type == "bq_witbox":
-            return "MarlinWitbox.hex"
-        elif machine_type == "ultimaker2_go":
-            return "MarlinUltimaker2go.hex"
-        elif machine_type == "ultimaker2_extended":
-            return "MarlinUltimaker2extended.hex"
-        elif machine_type == "ultimaker2":
-            return "MarlinUltimaker2.hex"
-        elif machine_type == "ultimaker2plus":
-            return "MarlinUltimaker2plus.hex"
-        elif machine_type == "ultimaker2_extended_plus":
-            return "MarlinUltimaker2extended-plus.hex"
+        if platform.system() == "Linux":
+            baudrate = 115200
         else:
-            Logger.log("e", "I don't know of any firmware for machine %s.", machine_type)
-            raise FileNotFoundError()
+            baudrate = 250000
+
+        # NOTE: The keyword used here is the id of the machine. You can find the id of your machine in the *.json file, eg.
+        # https://github.com/Ultimaker/Cura/blob/master/resources/machines/ultimaker_original.json#L2
+        # The *.hex files are stored at a seperate repository:
+        # https://github.com/Ultimaker/cura-binary-data/tree/master/cura/resources/firmware
+        machine_without_extras  = {"bq_witbox"                : "MarlinWitbox.hex",
+                                   "ultimaker_original"       : "MarlinUltimaker-{baudrate}.hex",
+                                   "ultimaker_original_plus"  : "MarlinUltimaker-UMOP-{baudrate}.hex",
+                                   "ultimaker2"               : "MarlinUltimaker2.hex",
+                                   "ultimaker2_go"            : "MarlinUltimaker2go.hex",
+                                   "ultimaker2plus"           : "MarlinUltimaker2plus.hex",
+                                   "ultimaker2_extended"      : "MarlinUltimaker2extended.hex",
+                                   "ultimaker2_extended_plus" : "MarlinUltimaker2extended-plus.hex",
+                                   }
+        machine_with_heated_bed = {"ultimaker_original"       : "MarlinUltimaker-HBK-{baudrate}.hex",
+                                   }
 
         ##TODO: Add check for multiple extruders
+        hex_file = None
+        if  machine_type in machine_without_extras.keys(): # The machine needs to be defined here!
+            if  machine_type in machine_with_heated_bed.keys() and machine_instance.getMachineSettingValue("machine_heated_bed"):
+                Logger.log("d", "Choosing firmware with heated bed enabled for machine %s.", machine_type)
+                hex_file = machine_with_heated_bed[machine_type] # Return firmware with heated bed enabled
+            else:
+                Logger.log("d", "Choosing basic firmware for machine %s.", machine_type)
+                hex_file = machine_without_extras[machine_type] # Return "basic" firmware
+        else:
+            Logger.log("e", "There is no firmware for machine %s.", machine_type)
+
+        if hex_file:
+            return hex_file.format(baudrate=baudrate)
+        else:
+            Logger.log("e", "Could not find any firmware for machine %s.", machine_type)
+            raise FileNotFoundError()
 
     def _addRemovePorts(self, serial_ports):
         # First, find and add all new or changed keys
diff --git a/resources/qml/ProfileSetup.qml b/resources/qml/ProfileSetup.qml
index 4365fe21ab..c0337f3b26 100644
--- a/resources/qml/ProfileSetup.qml
+++ b/resources/qml/ProfileSetup.qml
@@ -74,9 +74,9 @@ Item{
                     MenuItem
                     {
                         id: item
-                        text: model_data.name
+                        text: model_data ? model_data.name : ""
                         checkable: true;
-                        checked: model_data.active;
+                        checked: model_data ? model_data.active : false;
                         exclusiveGroup: profileSelectionMenuGroup;
                         onTriggered:
                         {
diff --git a/resources/themes/cura/styles.qml b/resources/themes/cura/styles.qml
index e89966daa4..5c88645330 100644
--- a/resources/themes/cura/styles.qml
+++ b/resources/themes/cura/styles.qml
@@ -295,6 +295,9 @@ QtObject {
         controlBorderHighlightColor: Theme.getColor("setting_control_border_highlight");
         controlTextColor: Theme.getColor("setting_control_text");
         controlBorderWidth: Theme.getSize("default_lining").width;
+        controlDisabledColor: Theme.getColor("setting_control_disabled");
+        controlDisabledTextColor: Theme.getColor("setting_control_disabled_text");
+        controlDisabledBorderColor: Theme.getColor("setting_control_disabled_border");
         controlFont: Theme.getFont("default");
 
         validationErrorColor: Theme.getColor("setting_validation_error");
diff --git a/resources/themes/cura/theme.json b/resources/themes/cura/theme.json
index 98ad721ab5..1c745237fd 100644
--- a/resources/themes/cura/theme.json
+++ b/resources/themes/cura/theme.json
@@ -138,6 +138,9 @@
         "setting_control_depth_line": [127, 127, 127, 255],
         "setting_control_button": [127, 127, 127, 255],
         "setting_control_button_hover": [70, 84, 113, 255],
+        "setting_control_disabled": [245, 245, 245, 255],
+        "setting_control_disabled_text": [127, 127, 127, 255],
+        "setting_control_disabled_border": [127, 127, 127, 255],
         "setting_unit": [127, 127, 127, 255],
         "setting_validation_error": [255, 57, 14, 255],
         "setting_validation_warning": [255, 186, 15, 255],