Fix extruder icon text scaling. I've added a new font size here since there is not any real way I can see to scale the font based on the component size. This is because we do some magic with the font numbers before passing them to the QML.

CURA-9793

resources/qml/ExtruderButton.qml

@@ -12,12 +12,14 @@ UM.ToolbarButton
     id: base
 
     property var extruder
+    property var extrdurerNumberFont: UM.Theme.getFont("small_emphasis")
 
     toolItem: ExtruderIcon
     {
         materialColor: extruder.color
         extruderEnabled: extruder.stack.isEnabled
         iconVariant: "default"
+        font: extruderNumberFont
         property int index: extruder.index
     }
 

resources/qml/ExtruderIcon.qml

@@ -14,6 +14,7 @@ Item
     property bool extruderEnabled: true
     property var iconSize: UM.Theme.getSize("extruder_icon").width
     property string iconVariant: "medium"
+    property alias font: extruderNumberText.font
 
     implicitWidth: iconSize
     implicitHeight: iconSize

resources/qml/Toolbar.qml

@@ -142,6 +142,7 @@ Item
                     text: catalog.i18ncp("@label %1 is filled in with the name of an extruder", "Print Selected Model with %1", "Print Selected Models with %1", UM.Selection.selectionCount).arg(extruder.name)
                     checked: Cura.ExtruderManager.selectedObjectExtruders.indexOf(extruder.id) != -1
                     enabled: UM.Selection.hasSelection && extruder.stack.isEnabled
+                    font: UM.Theme.getFont("small_emphasis")
 
                     onClicked:
                     {

resources/qml/Widgets/SingleSettingExtruderSelectorBar.qml

@@ -61,6 +61,7 @@ Row
                 extruder: model
                 checked: extruder.index == selectedIndex
                 iconScale: 0.8
+                font: UM.Theme.getFont("tiny_emphasis")
                 buttonSize: UM.Theme.getSize("small_button").width
                 onClicked: extruder.enabled && onClickExtruder(extruder.index)
             }

resources/themes/cura-light/theme.json

@@ -172,6 +172,26 @@
             "size": 0.9,
             "weight": 700,
             "family": "Noto Sans"
+        },
+        "tiny_emphasis": {
+            "size": 0.7,
+            "weight": 700,
+            "family": "Noto Sans"
+        },
+        "tiny_emphasis_ja_JP": {
+            "size": 0.7,
+            "weight": 700,
+            "family": "Noto Sans"
+        },
+        "tiny_emphasis_zh_CN": {
+            "size": 0.7,
+            "weight": 700,
+            "family": "Noto Sans"
+        },
+        "tiny_emphasis_zh_TW": {
+            "size": 0.7,
+            "weight": 700,
+            "family": "Noto Sans"
         }
     },