diff --git a/web/app/3d/ctrl.js b/web/app/3d/ctrl.js
index 112ad226..a38537ef 100644
--- a/web/app/3d/ctrl.js
+++ b/web/app/3d/ctrl.js
@@ -9,9 +9,10 @@ TCAD.UI = function(app) {
   var cameraFolder = new TCAD.toolkit.Folder("Camera");
   var objectsFolder = new TCAD.toolkit.Folder("Objects");
   var modificationsFolder = new TCAD.toolkit.Folder("Modifications");
+  var extrude, cut, edit;
   TCAD.toolkit.add(box, propFolder);
-  TCAD.toolkit.add(propFolder, new TCAD.toolkit.Button("Extrude"));
-  TCAD.toolkit.add(propFolder, new TCAD.toolkit.Button("Cut"));
+  TCAD.toolkit.add(propFolder, extrude = new TCAD.toolkit.Button("Extrude"));
+  TCAD.toolkit.add(propFolder, cut = new TCAD.toolkit.Button("Cut"));
   TCAD.toolkit.add(propFolder, new TCAD.toolkit.Button("Edit"));
   TCAD.toolkit.add(propFolder, new TCAD.toolkit.Button("Refresh Sketches"));
   TCAD.toolkit.add(propFolder, new TCAD.toolkit.Text("Message"));
@@ -35,6 +36,32 @@ TCAD.UI = function(app) {
     modificationsTreeComp.set(data);
   });
 
+  cut.root.click(function() {
+    if (app.viewer.selectionMgr.selection.length == 0) {
+      return;
+    }
+    var face = app.viewer.selectionMgr.selection[0];
+    var normal = TCAD.utils.vec(face.csgGroup.plane.normal);
+    var polygons = TCAD.craft.getSketchedPolygons3D(app, face);
+
+    var tk = TCAD.toolkit;
+    var ops = new tk.Box();
+    ops.root.css({left : (box.root.width() + 10) + 'px', top : 0});
+    var folder = new tk.Folder("Cut Options");
+    tk.add(ops, folder);
+    var depth = new tk.Number("Depth", 50);
+    var wizard = new TCAD.wizards.ExtrudeWizard(app.viewer, polygons);
+    depth.input.on('t-change', function() {
+      var depthValue = $(this).val();
+      var target = normal.negate().multiply(depthValue);
+      wizard.update(target);
+      app.viewer.render()
+    });
+    depth.input.trigger('t-change');
+    tk.add(folder, depth);
+    tk.add(folder, new tk.ButtonRow(["Cancel", "OK"], [tk.methodRef(folder, "close"), ]));
+  });
+
   this.dat = new dat.GUI();
   var gui = this.dat;
 
diff --git a/web/app/3d/wizards/wizards.js b/web/app/3d/wizards/wizards.js
new file mode 100644
index 00000000..60f38dcd
--- /dev/null
+++ b/web/app/3d/wizards/wizards.js
@@ -0,0 +1,49 @@
+TCAD.wizards = {};
+
+TCAD.wizards.OpWizard = function(viewer) {
+  this.previewGroup = new THREE.Object3D();
+  this.previewGroup.renderDepth = 1e20;
+  viewer.scene.add(this.previewGroup);
+  this.lines = [];
+};
+
+TCAD.wizards.OpWizard.prototype.setupLine = function(lineId, a, b) {
+  var line = this.lines[lineId];
+  if (line === undefined) {
+    var lg = new THREE.Geometry();
+    lg.vertices.push(new THREE.Vector3().copy(a));
+    lg.vertices.push(new THREE.Vector3().copy(b));
+    TCAD.SketchFace.prototype.WIREFRAME_MATERIAL.depthWrite = false;
+    line = new THREE.Segment(lg, TCAD.SketchFace.prototype.WIREFRAME_MATERIAL);
+    line.renderDepth = 0;
+    this.previewGroup.add(line);
+    this.lines[lineId] = line;
+  } else {
+    line.geometry.vertices[0] = new THREE.Vector3().copy(a);
+    line.geometry.vertices[1] = new THREE.Vector3().copy(b);
+    line.geometry.verticesNeedUpdate = true;
+  }
+};
+
+TCAD.wizards.ExtrudeWizard = function(viewer, polygons) {
+  TCAD.wizards.OpWizard.call(this, viewer);
+  this.polygons = polygons;
+};
+
+TCAD.wizards.ExtrudeWizard.prototype = Object.create( TCAD.wizards.OpWizard.prototype );
+
+TCAD.wizards.ExtrudeWizard.prototype.update = function(target) {
+  var linesCounter = 0;
+  for (var i = 0; i < this.polygons.length; i++) {
+    var poly = this.polygons[i];
+    var lid = TCAD.geom.calculateExtrudedLid(poly, target, 1);
+    var p, q, n = poly.length;
+    for (p = n - 1, q = 0; q < n; p = q++) {
+      this.setupLine(linesCounter ++, poly[p], poly[q]);
+      this.setupLine(linesCounter ++, lid[p], lid[q]);
+    }
+    for (q = 0; q < n; q++) {
+      this.setupLine(linesCounter ++, poly[q], lid[q]);
+    }
+  }
+};
diff --git a/web/app/engine.js b/web/app/engine.js
index 89279568..dee46239 100644
--- a/web/app/engine.js
+++ b/web/app/engine.js
@@ -336,6 +336,15 @@ TCAD.geom.isCCW = function(path2D) {
   return TCAD.geom.area(path2D) >= 0;
 };
 
+
+TCAD.geom.calculateExtrudedLid = function(sourcePolygon, direction, lateralExpansionFactor) {
+  var lid = [];
+  for (var si = 0; si < sourcePolygon.length; ++si) {
+    lid[si] = sourcePolygon[si].plus(direction);
+  }
+  return lid;
+};
+
 TCAD.geom.extrude = function(source, target, sourceNormal) {
 
   var extrudeDistance = target.normalize().dot(sourceNormal);
@@ -345,10 +354,7 @@ TCAD.geom.extrude = function(source, target, sourceNormal) {
   var negate = extrudeDistance < 0;
 
   var poly = [null, null];
-  var lid = [];
-  for (var si = 0; si < source.length; ++si) {
-    lid[si] = source[si].plus(target);
-  }
+  var lid = TCAD.geom.calculateExtrudedLid(source, target, 1);
 
   var bottom, top;
   if (negate) {
@@ -536,9 +542,9 @@ TCAD.SketchFace = function(solid, csgGroup) {
 
 if (typeof THREE !== "undefined") {
   TCAD.SketchFace.prototype.SKETCH_MATERIAL = new THREE.LineBasicMaterial({
-    color: 0xFFFFFF, linewidth: 3});
+    color: 0xFFFFFF, linewidth: 3/TCAD.DPR});
   TCAD.SketchFace.prototype.WIREFRAME_MATERIAL = new THREE.LineBasicMaterial({
-    color: 0x2B3856, linewidth: 3});
+    color: 0x2B3856, linewidth: 3/TCAD.DPR});
 }
 
 TCAD.SketchFace.prototype.calcBasis = function() {
diff --git a/web/index.html b/web/index.html
index 17119553..57f1f3cf 100644
--- a/web/index.html
+++ b/web/index.html
@@ -13,7 +13,8 @@
 
   <script src="lib/jquery-2.1.0.min.js"></script>
   <script src="lib/three/three.js"></script>
-  <script> THREE.Line = THREE.Segment </script><!-- Intelij renamed all THREE.Line to THREE.Segment by mistake. It will not be needed after updating three.js-->
+
+  <script> THREE.Segment = THREE.Line </script><!-- Intelij renamed all THREE.Line to THREE.Segment by mistake. It will not be needed after updating three.js-->
   <script src="lib/three/TrackballControls.js"></script>
   <script src="lib/three/OrbitControls.js"></script>
   <script src="lib/three/TransformControls.js"></script>
@@ -30,6 +31,7 @@
   <script src="app/math/graph.js"></script>
   <script src="app/3d/hashmap.js"></script>
   <script src="app/ui/toolkit.js"></script>
+  <script src="app/3d/wizards/wizards.js"></script>
 
   <script>window.onload = function() {
     window._TCAD_APP = new TCAD.App();