diff --git a/src/kiri/init.js b/src/kiri/init.js
index 4e928651..2deeb528 100644
--- a/src/kiri/init.js
+++ b/src/kiri/init.js
@@ -490,10 +490,7 @@
     }
 
     function mirrorSelection() {
-        API.selection.for_widgets(function(widget) {
-            widget.mirror();
-        });
-        SPACE.update();
+        API.selection.mirror();
     }
 
     function keys(o) {
@@ -540,7 +537,7 @@
             y = y - current.device.bedDepth/2 + (bounds.max.y - bounds.min.y)/2
         }
 
-        moveSelection(x, y, z, true);
+        API.selection.move(x, y, z, true);
     }
 
     function deviceExport(exp, name) {
diff --git a/src/kiri/main.js b/src/kiri/main.js
index f62cfb8f..b85f5036 100644
--- a/src/kiri/main.js
+++ b/src/kiri/main.js
@@ -77,6 +77,7 @@
         move: moveSelection,
         scale: scaleSelection,
         rotate: rotateSelection,
+        mirror: mirrorSelection,
         meshes: function() { return selectedMeshes.slice() },
         widgets: function(orall) {
             let sel = selectedMeshes.slice().map(m => m.widget);
@@ -1454,6 +1455,15 @@
         SPACE.update();
     }
 
+    function mirrorSelection() {
+        API.selection.for_widgets(function(widget) {
+            widget.mirror();
+            API.event.emit("widget.mirror", widget);
+        });
+        SPACE.update();
+        auto_save();
+    }
+
     function moveSelection(x, y, z, abs) {
         if (viewMode !== VIEWS.ARRANGE) return;
         forSelectedGroups(function (w) {
diff --git a/src/mode/fdm/client.js b/src/mode/fdm/client.js
index 28c339a9..92d266da 100644
--- a/src/mode/fdm/client.js
+++ b/src/mode/fdm/client.js
@@ -294,6 +294,17 @@
                 func.sclear();
             }
         });
+        api.event.on("widget.mirror", widget => {
+            if (!isFdmMode) {
+                return;
+            }
+            let ann = API.widgets.annotate(widget.id);
+            let sups = ann.support || [];
+            sups.forEach(sup => {
+                let wsup = widget.sups[sup.id];
+                wsup.box.position.x = wsup.x = sup.x = -sup.x;
+            });
+        });
         api.event.on("widget.rotate", rot => {
             if (!isFdmMode) {
                 return;