diff --git a/web/app/3d/craft/brep/cut-extrude.js b/web/app/3d/craft/brep/cut-extrude.js
index ac607ac3..9636995a 100644
--- a/web/app/3d/craft/brep/cut-extrude.js
+++ b/web/app/3d/craft/brep/cut-extrude.js
@@ -23,9 +23,14 @@ export function Cut(app, params) {
 export function doOperation(app, params, cut) {
   const face = app.findFace(params.face);
   const solid = face.solid;
-  const reverseNormal = !cut;
+  let reverseNormal = !cut;
   
   let normal = face.normal();
+  if (params.value < 0) {
+    params = fixNegativeValue(params);
+    reverseNormal = !reverseNormal;
+  }
+
   if (reverseNormal) normal = normal.negate();
   const sketch = ReadSketchFromFace(app, face, reverseNormal);
   
@@ -54,6 +59,14 @@ export function doOperation(app, params, cut) {
   }
 }
 
+export function fixNegativeValue(params) {
+  if (params.value < 0) {
+    params = Object.assign({}, params);
+    params.value *= -1;
+  } 
+  return params;
+} 
+
 function combineShells(shells) {
   if (shells.length == 1) {
     return shells[0];
diff --git a/web/app/3d/craft/brep/wizards/cut-extrude.js b/web/app/3d/craft/brep/wizards/cut-extrude.js
index 74d12876..22d562ca 100644
--- a/web/app/3d/craft/brep/wizards/cut-extrude.js
+++ b/web/app/3d/craft/brep/wizards/cut-extrude.js
@@ -1,9 +1,9 @@
 import {CURRENT_SELECTION as S} from './wizard'
 import {PreviewWizard, SketchBasedPreviewer} from './preview-wizard'
-import {ParametricExtruder} from '../cut-extrude'
+import {ParametricExtruder, fixNegativeValue} from '../cut-extrude'
 
 const METADATA = [
-  ['value'   , 'number',  50,  {min: 0}],
+  ['value'   , 'number',  50],
   ['prism'   , 'number',  1 ,  {min: 0, step: 0.1, round: 1}],
   ['angle'   , 'number',  0 ,  {}],
   ['rotation', 'number',  0 ,  {step: 5}],
@@ -48,11 +48,15 @@ export class ExtrudePreviewer extends SketchBasedPreviewer {
   }
   
   createImpl(app, params, sketch, face) {
-    const parametricExtruder = new ParametricExtruder(params);
-
     const normal = face.normal();
-    const baseNormal = this.inversed ? normal : normal.negate();
-    const lidNormal = this.inversed ? baseNormal.negate() : normal;
+    let reverseNormal = this.inversed;
+    if (params.value < 0) {
+      params = fixNegativeValue(params);
+      reverseNormal = !reverseNormal;
+    }
+    const parametricExtruder = new ParametricExtruder(params);
+    const baseNormal = reverseNormal ? normal : normal.negate();
+    const lidNormal =  reverseNormal ? baseNormal.negate() : normal;
     
     parametricExtruder.prepareLidCalculation(baseNormal, lidNormal);
     
diff --git a/web/app/3d/craft/brep/wizards/plane.js b/web/app/3d/craft/brep/wizards/plane.js
index 01b128a9..f1b7a0c2 100644
--- a/web/app/3d/craft/brep/wizards/plane.js
+++ b/web/app/3d/craft/brep/wizards/plane.js
@@ -17,8 +17,8 @@ export class PlaneWizard extends PreviewWizard {
   
   createPreviewObject(app, params) {
     let face = null;
-    if (params.face) {
-      face = this.app.findFace(params.face);
+    if (params.parallelTo) {
+      face = this.app.findFace(params.parallelTo);
     }
     let basis;
     let depth = params.depth;
diff --git a/web/app/3d/craft/operations.js b/web/app/3d/craft/operations.js
index f4d67301..587c9aa4 100644
--- a/web/app/3d/craft/operations.js
+++ b/web/app/3d/craft/operations.js
@@ -52,7 +52,7 @@ export const PLANE = {
   action: (app, request) => {
     return {
       outdated: [],
-      created: [PlaneSceneObject.create(request)]
+      created: [PlaneSceneObject.create(request, (f) => app.findFace(f))]
     }
   }
 };
diff --git a/web/app/3d/scene/plane-scene-object.js b/web/app/3d/scene/plane-scene-object.js
index eca80296..86672949 100644
--- a/web/app/3d/scene/plane-scene-object.js
+++ b/web/app/3d/scene/plane-scene-object.js
@@ -56,8 +56,8 @@ export class PlaneSceneObject extends SceneSolid {
   
   static create(params, faceResolver) {
     let face = null;
-    if (params.face) {
-      face = faceResolver(params.face);
+    if (params.parallelTo) {
+      face = faceResolver(params.parallelTo);
     }
     let plane = null;
     if (face == null) {