diff --git a/js/kiri-slicer.js b/js/kiri-slicer.js
index 0a5cb38d..7195fc38 100644
--- a/js/kiri-slicer.js
+++ b/js/kiri-slicer.js
@@ -200,7 +200,7 @@ var gs_kiri_slicer = exports;
             }
             for (key in zFlat) {
                 // todo make threshold for flat detection configurable
-                if (!zFlat.hasOwnProperty(key) || zFlat[key] < 100) continue;
+                if (!zFlat.hasOwnProperty(key) || zFlat[key] < 10) continue;
                 if (!zIndexes.contains(key) && key >= zMin) zIndexes.push(parseFloat(key));
             }
             // sort top down
diff --git a/js/license.js b/js/license.js
index 19550285..83e49768 100644
--- a/js/license.js
+++ b/js/license.js
@@ -1,7 +1,7 @@
 var exports = {
     COPYRIGHT:"Copyright (C) 2014-2018 Stewart Allen <sa@grid.space> - All Rights Reserved",
     LICENSE:"See the license.md file included with the source distribution",
-    VERSION:"1.2.4d"
+    VERSION:"1.2.4e"
 };
 if (!module) var module = {};
 module.exports = exports;