diff --git a/resources/qml/ActionPanelWidget.qml b/resources/qml/ActionPanelWidget.qml
index d1fe999731..b4a9b4e4ec 100644
--- a/resources/qml/ActionPanelWidget.qml
+++ b/resources/qml/ActionPanelWidget.qml
@@ -37,6 +37,7 @@ Rectangle
     }
 
     Behavior on height { NumberAnimation { duration: 100 } }
+    Behavior on width { NumberAnimation { duration: 100 } }
 
     Component
     {
diff --git a/resources/qml/SliceProcessWidget.qml b/resources/qml/SliceProcessWidget.qml
index 67005cb133..561e38c372 100644
--- a/resources/qml/SliceProcessWidget.qml
+++ b/resources/qml/SliceProcessWidget.qml
@@ -12,7 +12,9 @@ Column
 {
     id: widget
 
-    spacing: UM.Theme.getSize("default_margin").height
+    width: UM.Theme.getSize("action_panel_button").width
+
+    spacing: UM.Theme.getSize("thin_margin").height
 
     UM.I18nCatalog
     {
@@ -23,30 +25,84 @@ Column
     property real progress: UM.Backend.progress
     property int backendState: UM.Backend.state
 
-    Rectangle
+    Item
+    {
+        id: message
+        width: parent.width
+        height: childrenRect.height
+        visible: widget.backendState == 4
+
+        UM.RecolorImage
+        {
+            id: warningImage
+
+            anchors.left: parent.left
+
+            source: UM.Theme.getIcon("warning")
+            width: UM.Theme.getSize("section_icon").width
+            height: UM.Theme.getSize("section_icon").height
+
+            sourceSize.width: width
+            sourceSize.height: height
+
+            color: UM.Theme.getColor("warning")
+        }
+
+        Label
+        {
+            id: unableToSliceLabel
+            anchors.left: warningImage.right
+            anchors.leftMargin: UM.Theme.getSize("thin_margin").width
+            text: catalog.i18nc("@label:PrintjobStatus", "Unable to Slice")
+            color: UM.Theme.getColor("warning")
+            font: UM.Theme.getFont("very_small")
+        }
+    }
+
+    // Progress bar, only visible when the backend is in the process of slice the printjob
+    ProgressBar
     {
         id: progressBar
         width: parent.width
         height: UM.Theme.getSize("progressbar").height
+        value: progress
         visible: widget.backendState == 2
-        radius: UM.Theme.getSize("progressbar_radius").width
-        color: UM.Theme.getColor("progressbar_background")
 
-        Rectangle
+        background: Rectangle
         {
-            width: Math.max(parent.width * base.progress)
-            height: parent.height
+            anchors.fill: parent
             radius: UM.Theme.getSize("progressbar_radius").width
-            color: UM.Theme.getColor("progressbar_control")
+            color: UM.Theme.getColor("progressbar_background")
+        }
+
+        contentItem: Item
+        {
+            anchors.fill: parent
+            Rectangle
+            {
+                width: progressBar.visualPosition * parent.width
+                height: parent.height
+                radius: UM.Theme.getSize("progressbar_radius").width
+                color: UM.Theme.getColor("progressbar_control")
+            }
         }
     }
 
     Cura.ActionButton
     {
         id: prepareButton
-        width: UM.Theme.getSize("action_panel_button").width
+        width: parent.width
         height: UM.Theme.getSize("action_panel_button").height
-        text: widget.backendState == 1 ? catalog.i18nc("@button", "Prepare") : catalog.i18nc("@button", "Cancel")
+        text: autoSlice ? catalog.i18nc("@button", "Auto slicing...") : (widget.backendState == 1 ? catalog.i18nc("@button", "Slice") : catalog.i18nc("@button", "Cancel"))
+        enabled: !autoSlice
+
+        // Get the current value from the preferences
+        property bool autoSlice: UM.Preferences.getValue("general/auto_slice")
+
+        disabledColor: "transparent"
+        textDisabledColor: UM.Theme.getColor("primary")
+        outlineDisabledColor: "transparent"
+
         onClicked:
         {
             if ([1, 5].indexOf(widget.backendState) != -1)
@@ -59,4 +115,15 @@ Column
             }
         }
     }
+
+    // React when the user changes the preference of having the auto slice enabled
+    Connections
+    {
+        target: UM.Preferences
+        onPreferenceChanged:
+        {
+            var autoSlice = UM.Preferences.getValue("general/auto_slice")
+            prepareButton.autoSlice = autoSlice
+        }
+    }
 }
diff --git a/resources/themes/cura-light/theme.json b/resources/themes/cura-light/theme.json
index d695ba12cf..1473a75eec 100644
--- a/resources/themes/cura-light/theme.json
+++ b/resources/themes/cura-light/theme.json
@@ -116,6 +116,7 @@
         "text_scene_hover": [70, 84, 113, 255],
 
         "error": [255, 140, 0, 255],
+        "warning": [255, 190, 35, 255],
 
         "button": [31, 36, 39, 255],
         "button_hover": [68, 72, 75, 255],
@@ -210,7 +211,7 @@
         "material_compatibility_warning": [0, 0, 0, 255],
 
         "progressbar_background": [245, 245, 245, 255],
-        "progressbar_control": [31, 36, 39, 255],
+        "progressbar_control": [50, 130, 255, 255],
 
         "slider_groove": [245, 245, 245, 255],
         "slider_groove_border": [127, 127, 127, 255],