SVG are not correlated to pixel size.

Although this deviates from the UX practices. It tended to confuse the
programmers ;-) The variances in level of detail for the icons are now
placed in the sub-directories. small, default and big.

CURA-8010_new_icons

resources/qml/ExtruderIcon.qml

@@ -22,7 +22,7 @@ Item
         id: mainIcon
         anchors.fill: parent
 
-        source: UM.Theme.getIcon("Extruder", "30")
+        source: UM.Theme.getIcon("Extruder", "large")
         color: extruderEnabled ? materialColor: UM.Theme.getColor("disabled")
     }
 

resources/qml/ObjectItemButton.qml

@@ -53,7 +53,7 @@ Button
             anchors.left: parent.left
             width: height
             height: parent.height - UM.Theme.getSize("narrow_margin").height
-            source: UM.Theme.getIcon("Extruder", "30")
+            source: UM.Theme.getIcon("Extruder", "large")
             color: extruderColor
             visible: showExtruderSwatches && extruderColor != ""
         }

resources/qml/PrintSetupSelector/Recommended/RecommendedSupportSelector.qml

@@ -229,7 +229,7 @@ Item
 
                     sourceSize.width: width
                     sourceSize.height: height
-                    source: UM.Theme.getIcon("Extruder", "30")
+                    source: UM.Theme.getIcon("Extruder", "large")
                     color: supportExtruderCombobox.color
                 }
             }
@@ -299,7 +299,7 @@ Item
 
                         sourceSize.width: width
                         sourceSize.height: height
-                        source: UM.Theme.getIcon("Extruder", "30")
+                        source: UM.Theme.getIcon("Extruder", "large")
                         color: supportExtruderCombobox.model.getItem(index).color
                     }
                 }

resources/qml/PrinterSelector/MachineSelector.qml

@@ -122,15 +122,15 @@ Cura.ExpandablePopup
             {
                 if (connectionStatus == "printer_connected")
                 {
-                    return UM.Theme.getIcon("CheckBlueBG", "12")
+                    return UM.Theme.getIcon("CheckBlueBG", "small")
                 }
                 else if (connectionStatus == "printer_cloud_connected")
                 {
-                    return UM.Theme.getIcon("CloudBlueBG", "12")
+                    return UM.Theme.getIcon("CloudBlueBG", "small")
                 }
                 else if (connectionStatus == "printer_cloud_not_available")
                 {
-                    return UM.Theme.getIcon("CloudGreyBG", "12")
+                    return UM.Theme.getIcon("CloudGreyBG", "small")
                 }
                 else
                 {

resources/qml/Settings/SettingExtruder.qml

@@ -171,7 +171,7 @@ SettingItem
 
                 sourceSize.width: width
                 sourceSize.height: height
-                source: UM.Theme.getIcon("Extruder", "30")
+                source: UM.Theme.getIcon("Extruder", "large")
                 color: control.color
             }
         }
@@ -240,7 +240,7 @@ SettingItem
 
                     sourceSize.width: width
                     sourceSize.height: height
-                    source: UM.Theme.getIcon("Extruder", "30")
+                    source: UM.Theme.getIcon("Extruder", "large")
                     color: control.model.getItem(index).color
                 }
             }

resources/qml/Settings/SettingOptionalExtruder.qml

@@ -172,7 +172,7 @@ SettingItem
 
                 sourceSize.width: width
                 sourceSize.height: height
-                source: UM.Theme.getIcon("Extruder", "30")
+                source: UM.Theme.getIcon("Extruder", "large")
                 color: control.color
             }
         }
@@ -237,7 +237,7 @@ SettingItem
 
                     sourceSize.width: width
                     sourceSize.height: height
-                    source: UM.Theme.getIcon("Extruder", "30")
+                    source: UM.Theme.getIcon("Extruder", "large")
                     color: control.model.getItem(index).color
                 }
             }

resources/themes/cura-light/styles.qml

@@ -422,7 +422,7 @@ QtObject
                     height: Math.round(parent.height / 2.5)
                     sourceSize.height: width
                     color: Theme.getColor("checkbox_mark")
-                    source: control.exclusiveGroup ? Theme.getIcon("Dot", "12") : Theme.getIcon("Check")
+                    source: control.exclusiveGroup ? Theme.getIcon("Dot", "small") : Theme.getIcon("Check")
                     opacity: control.checked
                     Behavior on opacity { NumberAnimation { duration: 100; } }
                 }
@@ -472,7 +472,7 @@ QtObject
                         }
                         else
                         {
-                            return control.exclusiveGroup ? Theme.getIcon("Dot", "12") : Theme.getIcon("Check");
+                            return control.exclusiveGroup ? Theme.getIcon("Dot", "small") : Theme.getIcon("Check");
                         }
                     }
                     opacity: control.checked