diff --git a/src/kiri.js b/src/kiri.js
index 16475cd3..71bcd37d 100644
--- a/src/kiri.js
+++ b/src/kiri.js
@@ -6,7 +6,7 @@
 
     if (!self.kiri) {
         self.kiri = {
-            beta: 3001,
+            beta: 3002,
             driver: {}, // driver modules
             loader: []  // module loading: array of functions
         };
diff --git a/src/kiri/conf.js b/src/kiri/conf.js
index 5821cab6..11b89ca3 100644
--- a/src/kiri/conf.js
+++ b/src/kiri/conf.js
@@ -297,6 +297,7 @@
                     sliceShells: 3,
                     sliceShellOrder: "in-out",
                     sliceLayerStart: "last",
+                    sliceLineWidth: 0,
                     sliceFillAngle: 45,
                     sliceFillWidth: 1,
                     sliceFillOverlap: 0.35,
diff --git a/src/kiri/init.js b/src/kiri/init.js
index 4542cf00..ad1eef56 100644
--- a/src/kiri/init.js
+++ b/src/kiri/init.js
@@ -1650,6 +1650,8 @@
             sliceMinHeight:      UC.newInput(LANG.ad_minl_s, {title:LANG.ad_minl_l, bound:UC.bound(0,3.0), convert:UC.toFloat, modes:FDM, show: () => UI.sliceAdaptive.checked}),
             fdmSep:              UC.newBlank({class:"pop-sep", modes:FDM}),
             sliceShells:         UC.newInput(LANG.sl_shel_s, {title:LANG.sl_shel_l, convert:UC.toFloat, modes:FDM}),
+            sliceLineWidth:      UC.newInput(LANG.sl_line_s, {title:LANG.sl_line_l, convert:UC.toFloat, bound:UC.bound(0,5), modes:FDM}),
+            fdmSep:              UC.newBlank({class:"pop-sep", modes:FDM}),
             sliceTopLayers:      UC.newInput(LANG.sl_ltop_s, {title:LANG.sl_ltop_l, convert:UC.toInt, modes:FDM}),
             sliceSolidLayers:    UC.newInput(LANG.sl_lsld_s, {title:LANG.sl_lsld_l, convert:UC.toInt, modes:FDM}),
             sliceBottomLayers:   UC.newInput(LANG.sl_lbot_s, {title:LANG.sl_lbot_l, convert:UC.toInt, modes:FDM}),
diff --git a/src/mode/fdm/slice.js b/src/mode/fdm/slice.js
index df14d835..b1272157 100644
--- a/src/mode/fdm/slice.js
+++ b/src/mode/fdm/slice.js
@@ -66,7 +66,6 @@
             sdev = settings.device,
             isBelt = sdev.bedBelt,
             isSynth = widget.track.synth,
-            update_start = Date.now(),
             minSolid = spro.sliceSolidMinArea,
             solidLayers = spro.sliceSolidLayers,
             vaseMode = spro.sliceFillType === 'vase' && !isSynth,
@@ -76,17 +75,14 @@
             sliceHeight = spro.sliceHeight,
             firstSliceHeight = isBelt ? sliceHeight : spro.firstSliceHeight,
             nozzleSize = sdev.extruders[extruder].extNozzle,
-            lineWidth = nozzleSize,
+            lineWidth = spro.sliceLineWidth || nozzleSize,
             fillOffsetMult = 1.0 - bound(spro.sliceFillOverlap, 0, 0.8),
-            firstWidthMult = spro.firstLayerShellMult || 1,
             shellOffset = lineWidth,
             fillSpacing = lineWidth,
             fillOffset = lineWidth * fillOffsetMult,
             sliceFillAngle = spro.sliceFillAngle,
             supportDensity = spro.sliceSupportDensity,
-            view = widget.mesh && widget.mesh.newGroup ? widget.mesh.newGroup() : null,
-            beltfact = Math.cos(Math.PI/4),
-            invbfact = 1 / beltfact;
+            beltfact = Math.cos(Math.PI/4);
 
         isFlat = ctrl.lineType === "flat";
         isThin = !isFlat && ctrl.lineType === "line";
diff --git a/web/kiri/lang/en.js b/web/kiri/lang/en.js
index bba0019c..20735e60 100644
--- a/web/kiri/lang/en.js
+++ b/web/kiri/lang/en.js
@@ -268,6 +268,8 @@ kiri.lang['en-us'] = {
     // FDM SHELLS
     sl_shel_s:      "shell count",
     sl_shel_l:      ["number of perimeter","walls to generate"],
+    sl_line_s:      "line width",
+    sl_line_l:      ["extrusion width in millimeters","0 = nozzle diameter"],
     sl_ordr_s:      "shell order",
     sl_ordr_l:      ["output shell order","inside to outside","or outside to inside","affects surface quality"],
     sl_strt_s:      "layer start",