diff --git a/js/geo-polygon.js b/js/geo-polygon.js
index 519c6e9a..d07c6fde 100644
--- a/js/geo-polygon.js
+++ b/js/geo-polygon.js
@@ -112,6 +112,16 @@ var gs_base_polygon = exports;
      * Polygon Prototype Functions
      ******************************************************************* */
 
+    PRO.toString = function() {
+        let l;
+        if (this.inner && this.inner.length) {
+            l = '/' + this.inner.map(i => i.toString()).join(',');
+        } else {
+            l = '';
+        }
+        return `P[${this.points.length,this.area().toFixed(2)}${l}]`;
+    };
+
     // return which plane (x,y,z) this polygon is coplanar with
     PRO.alignment = function() {
         if (this._aligned) return this._aligned;
diff --git a/js/kiri-slicer.js b/js/kiri-slicer.js
index ebb29afd..e3f0a08e 100644
--- a/js/kiri-slicer.js
+++ b/js/kiri-slicer.js
@@ -184,10 +184,8 @@ let gs_kiri_slicer = exports;
             }).sort((a,b) => {
                 return b[0] - a[0];
             }).forEach((e,i) => {
-                // console.log(e)
                 if (i > 0) {
                     let zd = le[0]-e[0];
-                    // console.log(e[0], zd);
                     if (zd > 0.1 && e[1] > 100) {
                         // zl.push(e)
                         zl[e[0].toFixed(5)] = e[1];
@@ -322,13 +320,12 @@ let gs_kiri_slicer = exports;
                 onFlat = false,
                 onLine = false;
             // ensure no slice through horizontal lines or planes
-            if (zFlat[ik]) {
-                zIndexes[i] -= 0.001;
-                onFlat = true;
-            }
-            if (zLines[ik]) {
-                zIndexes[i] -= 0.001;
-                onLine = true;
+            if (zFlat[ik]) onFlat = true;
+            if (zLines[ik]) onLine = true;
+            if (onFlat || onLine) zIndexes[i] -= 0.001;
+            if ((onFlat || onLine) && options.cam) {
+                // reverse on line compensation for cam mode
+                zIndexes[i] += 0.002;
             }
             // slice next layer and add to slices[] array
             sliceZ(zIndexes[i], zHeights[i], onFlat, onLine);
@@ -435,20 +432,16 @@ let gs_kiri_slicer = exports;
         function sliceZ(z, height, onflat, online) {
             let phash = {},
                 lines = [],
-                zkey = z.toFixed(5),
                 slice = newSlice(z, options.view ? options.view.newGroup() : null),
                 bucket = bucketCount == 1 ? points : buckets[Math.floor(z * zScale)];
 
-            if (!bucket) return;
+            if (!bucket) {
+                return;
+            }
 
-            if (onflat) {
-                // annotate slices with cam flats for finishing waterlines
-                if (options.cam) {
-                    slice.hasFlats = true;
-                    // since default onflat pushes Z down by 0.001 and in cam
-                    // mode we want the opposite, overcompsate above the Z
-                    z += 0.002;
-                }
+            // annotate slices with cam flats for finishing waterlines
+            if (onflat && options.cam) {
+                slice.hasFlats = true;
             }
 
             // iterate over matching buckets for this z offset
@@ -533,7 +526,6 @@ let gs_kiri_slicer = exports;
                     });
                 }
             }
-
             slices.push(slice);
         }
     }
diff --git a/js/license.js b/js/license.js
index 4b2176c4..c6dc80ba 100644
--- a/js/license.js
+++ b/js/license.js
@@ -1,7 +1,7 @@
 var exports = {
     COPYRIGHT:"Copyright (C) Stewart Allen <sa@grid.space> - All Rights Reserved",
     LICENSE:"See the license.md file included with the source distribution",
-    VERSION:"1.9.1"
+    VERSION:"1.9.2"
 };
 if (!module) var module = {};
 module.exports = exports;