diff --git a/js/kiri-driver-laser.js b/js/kiri-driver-laser.js
index 112a88fe..5cfa6c63 100644
--- a/js/kiri-driver-laser.js
+++ b/js/kiri-driver-laser.js
@@ -59,12 +59,21 @@ var gs_kiri_laser = exports;
             }
         }
 
+        var breakout = true;
+        var object = [];
+
         slice.tops.forEach(function(top) {
-            var object = [];
             laserOut(top.traces, object);
             laserOut(top.innerTraces(), object);
-            objects.push(object);
+            if (breakout) {
+                objects.push(object);
+                objects = [];
+            }
         });
+
+        if (!breakout) {
+            objects.push(object);
+        }
     };
 
     /**
diff --git a/js/kiri.js b/js/kiri.js
index 77421315..edfcb496 100644
--- a/js/kiri.js
+++ b/js/kiri.js
@@ -2280,7 +2280,7 @@ self.kiri.license = exports.LICENSE;
         WIN.addEventListener("resize", onWindowResize);
 
         SPACE.showSkyGrid(false);
-        SPACE.setSkyColor(0xf8f8f8);
+        SPACE.setSkyColor(0xffffff);
         SPACE.init(container, function (delta) {
             if (showLayerMax === 0) return;
             if (settings.controller.reverseZoom) delta = -delta;
@@ -2521,7 +2521,8 @@ self.kiri.license = exports.LICENSE;
             firstLayerBedTemp: UC.newInput("bed temp", {title:"degrees celsius\nused when non-zero", convert:UC.toInt, modes:FDM}),
 
             laserOffset: UC.newInput("cut offset", {title:"millimeters\nadjust for beam width", convert:UC.toFloat, modes:LASER}),
-            laserSliceHeight: UC.newInput("layer height", {title:"millimeters\n0 = auto/detect", convert:UC.toFloat, modes:LASER}),
+            laserSliceHeight: UC.newInput("height", {title:"millimeters\n0 = auto/detect", convert:UC.toFloat, modes:LASER}),
+            laserSliceSingle: UC.newBoolean("single", onBooleanClick, {title:"perform one slice\nat specified height", modes:LASER}),
 
             roughing: UC.newGroup("roughing", null, {modes:CAM}),
             roughingTool: UC.newSelectField("tool", {modes:CAM}),
@@ -2569,6 +2570,7 @@ self.kiri.license = exports.LICENSE;
             outputTileScaling: UC.newInput("scaling", {title:"multiplier (0.1 to 100)", convert:UC.toInt, bound:UC.bound(0.1,100), modes:LASER}),
             outputLaserPower: UC.newInput("power", {title:"0 - 100 %", convert:UC.toInt, bound:UC.bound(1,100), modes:LASER}),
             outputLaserSpeed: UC.newInput("speed", {title:"millimeters / minute", convert:UC.toInt, modes:LASER}),
+            outputLaserGroup: UC.newBoolean("group", onBooleanClick, {title:"retain layer as\nsingle grouped object", modes:LASER}),
 
             outputTemp: UC.newInput("nozzle temp", {title:"degrees celsius", convert:UC.toInt, modes:FDM}),
             outputBedTemp: UC.newInput("bed temp", {title:"degrees celsius", convert:UC.toInt, modes:FDM}),
diff --git a/notes.md b/notes.md
index 312fce1d..49c3be97 100644
--- a/notes.md
+++ b/notes.md
@@ -15,6 +15,7 @@
 
 # FDM todo
 
+* adaptive column to compensate for fine or layers that finish too quickly and melt
 * store/recover grid:print target against printer selected in device
 * expand internal supporting flats
 * first layer support speed should be same as shell speed