diff --git a/web/app/cad/craft/operationPlugin.ts b/web/app/cad/craft/operationPlugin.ts
index bd16ba08..aef03710 100644
--- a/web/app/cad/craft/operationPlugin.ts
+++ b/web/app/cad/craft/operationPlugin.ts
@@ -129,9 +129,10 @@ export interface OperationDescriptor<R> {
   actionParams?: any;
   run: (request: R, opContext: CoreContext) => OperationResult | Promise<OperationResult>;
   paramsInfo: (params: R) => string,
-  previewGeomProvider: (params: R) => OperationGeometryProvider,
+  previewGeomProvider?: (params: R) => OperationGeometryProvider,
   form: () => React.ReactNode,
-  schema: any
+  schema: any,
+  onParamsUpdate?: (params, name, value) => void
 }
 
 export interface OperationService {
diff --git a/web/app/cad/mdf/generateForm.tsx b/web/app/cad/mdf/generateForm.tsx
new file mode 100644
index 00000000..8b48b69b
--- /dev/null
+++ b/web/app/cad/mdf/generateForm.tsx
@@ -0,0 +1,31 @@
+import React from 'react';
+import Entity from '../craft/wizard/components/form/Entity';
+import { CheckboxField, NumberField } from '../craft/wizard/components/form/Fields';
+import { Group } from '../craft/wizard/components/form/Form';
+import { OperationSchema, SchemaField } from './mdf';
+
+export function generateForm(schema: OperationSchema) {
+
+  return function MDForm() {
+    return <Group>
+      {Object.keys(schema).map(key => {
+
+        const fieldDef: SchemaField = schema[key];
+        const label = fieldDef.label || key;  
+
+        if (fieldDef.type === 'number') {
+          return <NumberField name={key} defaultValue={fieldDef.defaultValue} label={label} />
+        } else if (['face', 'edge', 'sketchObject', 'datumAxis'].includes(fieldDef.type)) {
+          return <Entity name={key} label={label} />;
+        } else if (fieldDef.type === 'boolean') {
+          return <CheckboxField name={key} label={label} />;
+        } else {
+          return "I don't know";
+        }   
+
+      })}
+    </Group>;
+  };
+  
+
+}
\ No newline at end of file
diff --git a/web/app/cad/mdf/mdf.ts b/web/app/cad/mdf/mdf.ts
new file mode 100644
index 00000000..7ec9c6d1
--- /dev/null
+++ b/web/app/cad/mdf/mdf.ts
@@ -0,0 +1,61 @@
+import { CoreContext } from "context";
+import { IconType } from "react-icons";
+import { OperationResult } from "../craft/craftPlugin";
+import { OperationDescriptor } from "../craft/operationPlugin";
+import { generateForm } from "./generateForm";
+
+
+interface MDFCommand<R> {
+  id: string;
+  label: string;
+  info: string;
+  icon: IconType | string;
+  run: (request: R, opContext: CoreContext) => OperationResult | Promise<OperationResult>;
+  paramsInfo: (params: R) => string,
+  schema: OperationSchema,
+  mutualExclusiveFields?: string[]
+}
+
+export type Coercable = any;
+
+export type OperationSchema = {
+  [key: string]: SchemaField
+};
+
+export interface SchemaField {
+  type: 'number' | 'face' | 'datumAxis' | 'edge' | 'sketchObject' | 'boolean'
+  defaultValue: Coercable,
+  optional: boolean,
+  label?: string
+}
+
+export function loadMDFCommand<R>(mdfCommand: MDFCommand<R>): OperationDescriptor<R> {
+  return {
+    id: mdfCommand.id,
+    label: mdfCommand.label,
+    icon: mdfCommand.icon,
+    info: mdfCommand.info,
+    paramsInfo: mdfCommand.paramsInfo,
+    onParamsUpdate: (params, name, value) => {
+      if (mdfCommand.mutualExclusiveFields) {
+        handleMutualExclusiveFields(mdfCommand.mutualExclusiveFields, params, name, value);
+      }
+    },
+    run: mdfCommand.run,
+    // actionParams: {
+    //   ...requiresFaceSelection(1)
+    // },
+    form: generateForm(mdfCommand.schema),
+    schema: mdfCommand.schema 
+  }
+}
+
+export function handleMutualExclusiveFields(mutualExclusiveFields, params, name, value) {
+  if (mutualExclusiveFields.includes(name)) {
+    mutualExclusiveFields.forEach(param => {
+      if (param !== name) {
+        delete params[param];
+      }
+    })
+  }
+}
\ No newline at end of file
diff --git a/web/app/cad/mdf/mdfExtrudeExample.ts b/web/app/cad/mdf/mdfExtrudeExample.ts
new file mode 100644
index 00000000..a2a163f7
--- /dev/null
+++ b/web/app/cad/mdf/mdfExtrudeExample.ts
@@ -0,0 +1,65 @@
+import { roundValueForPresentation as r } from '../craft/operationHelper';
+
+
+export const MDF_EXTRUDE_EXAMPLE = {
+    id: 'EXTRUDE',
+    label: 'Extrude',
+    icon: 'img/cad/extrude',
+    info: 'extrudes 2D sketch',
+    paramsInfo: ({ value }) => `(${r(value)})`,
+    mutualExclusiveFields: ['datumAxisVector', 'edgeVector', 'sketchSegmentVector'],
+    run: (params, ctx) => {
+        return ctx.craftEngine.cutExtrude(false, params);
+    },
+    schema: {
+        value: {
+            type: 'number',
+            defaultValue: 50,
+            label: 'height'
+        },
+        wierdField: {
+            type: 'number',
+            defaultValue: 50,
+            label: 'weird field'
+        },
+        prism: {
+            type: 'number',
+            min: 0,
+            defaultValue: 1
+        },
+        angle: {
+            type: 'number',
+            defaultValue: 0
+        },
+        rotation: {
+            type: 'number',
+            defaultValue: 0
+        },
+        face: {
+            type: 'face',
+            initializeBySelection: 0
+        },
+        datumAxisVector: {
+            type: 'datumAxis',
+            optional: true,
+            label: 'datum axis'
+        },
+        edgeVector: {
+            type: 'edge',
+            optional: true,
+            label: 'edge',
+            accept: edge => edge.brepEdge.curve.degree === 1
+        },
+        sketchSegmentVector: {
+            type: 'sketchObject',
+            optional: true,
+            label: 'sketch segment',
+            accept: obj => obj.isSegment
+        },
+        flip: {
+            type: 'boolean',
+            defaultValue: false,
+        }
+
+    }
+}
diff --git a/web/app/cad/part/partOperationsPlugin.js b/web/app/cad/part/partOperationsPlugin.js
index 9c9a438c..798b9e7a 100644
--- a/web/app/cad/part/partOperationsPlugin.js
+++ b/web/app/cad/part/partOperationsPlugin.js
@@ -15,13 +15,16 @@ import coneOperation from '../craft/primitives/cone/coneOperation';
 import spatialCurveOperation from '../craft/spatialCurve/spatialCurveOperation';
 import loftOperation from '../craft/loft/loftOperation';
 import {intersectionOperation, subtractOperation, unionOperation} from '../craft/boolean/booleanOperation';
+import { loadMDFCommand } from '../mdf/mdf';
+import { MDF_EXTRUDE_EXAMPLE } from '../mdf/mdfExtrudeExample';
 
 
 export function activate({services}) {
   services.operation.registerOperations([
     planeOperation,
     boxOperation, 
-    extrudeOperation,
+    // extrudeOperation,
+    loadMDFCommand(MDF_EXTRUDE_EXAMPLE),
     cutOperation,
     revolveOperation,
     filletOperation,