diff --git a/src/mode/cam/client.js b/src/mode/cam/client.js
index 815ad8fa..61565beb 100644
--- a/src/mode/cam/client.js
+++ b/src/mode/cam/client.js
@@ -359,6 +359,7 @@
         });
 
         func.opFlip = () => {
+            let widgets = API.widgets.all();
             let { process } = current;
             let { ops, op2 } = process;
             // add flip singleton to b-side
@@ -371,7 +372,7 @@
                 middle: "middle"
             }[process.camZAnchor];
             // flip tabs
-            API.widgets.all().forEach(widget => {
+            for (let widget of widgets) {
                 let anno = API.widgets.annotate(widget.id).tab || [];
                 let wbm = widget.bounds.max.z;
                 for (let tab of anno) {
@@ -398,7 +399,7 @@
                 }
                 clearTabs(widget, true);
                 restoreTabs([widget]);
-            });
+            }
             // flip widget
             if (axis === 'X') {
                 API.selection.rotate(Math.PI, 0, 0);
@@ -409,6 +410,11 @@
             flipping = false;
             process.ops = op2;
             process.op2 = ops;
+            // special case, auto-adjust camZBottom
+            if (process.camZBottom && widgets.length === 1) {
+                process.camZBottom = widgets[0].bounds.max.z - process.camZBottom;
+                API.util.rec2ui(process);
+            }
             for (let op of op2) {
                 if (op.type === 'flip') {
                     op.axis = poppedRec.axis;
diff --git a/src/mode/cam/slice.js b/src/mode/cam/slice.js
index 25be65de..be40d80a 100644
--- a/src/mode/cam/slice.js
+++ b/src/mode/cam/slice.js
@@ -262,7 +262,7 @@
     function cutTabs(tabs, offset, z) {
         let noff = [];
         tabs = tabs.filter(tab => z < tab.pos.z + tab.dim.z/2).map(tab => tab.off).flat();
-        offset.forEach(op => noff.appendAll( op.cut(POLY.union(tabs)) ));
+        offset.forEach(op => noff.appendAll( op.cut(POLY.union(tabs, 0, true)) ));
         if (noff.length > 1) {
             let heal = 0;
             // heal/rejoin open segments that share endpoints