---
title: "extrude"
subtitle: "Function in std::sketch"
excerpt: "Extend a 2-dimensional sketch through a third dimension in order to create new 3-dimensional volume, or if extruded into an existing volume, cut into an existing solid."
layout: manual
---

Extend a 2-dimensional sketch through a third dimension in order to create new 3-dimensional volume, or if extruded into an existing volume, cut into an existing solid.

```kcl
extrude(
  @sketches: [Sketch],
  length: number,
  symmetric?: bool,
  bidirectionalLength?: number,
  tagStart?: TagDeclarator,
  tagEnd?: TagDeclarator,
): [Solid]
```

You can provide more than one sketch to extrude, and they will all be extruded in the same direction.

### Arguments

| Name | Type | Description | Required |
|----------|------|-------------|----------|
| `sketches` | [`[Sketch]`](/docs/kcl-std/types/std-types-Sketch) | Which sketch or sketches should be extruded | Yes |
| `length` | [`number`](/docs/kcl-std/types/std-types-number) | How far to extrude the given sketches | Yes |
| `symmetric` | [`bool`](/docs/kcl-std/types/std-types-bool) | If true, the extrusion will happen symmetrically around the sketch. Otherwise, the extrusion will happen on only one side of the sketch. | No |
| `bidirectionalLength` | [`number`](/docs/kcl-std/types/std-types-number) | If specified, will also extrude in the opposite direction to 'distance' to the specified distance. If 'symmetric' is true, this value is ignored. | No |
| `tagStart` | [`TagDeclarator`](/docs/kcl-lang/types#TagDeclarator) | A named tag for the face at the start of the extrusion, i.e. the original sketch | No |
| `tagEnd` | [`TagDeclarator`](/docs/kcl-lang/types#TagDeclarator) | A named tag for the face at the end of the extrusion, i.e. the new face created by extruding the original sketch | No |

### Returns

[`[Solid]`](/docs/kcl-std/types/std-types-Solid)


### Examples

```kcl
example = startSketchOn(XZ)
  |> startProfile(at = [0, 0])
  |> line(end = [10, 0])
  |> arc(angleStart = 120, angleEnd = 0, radius = 5)
  |> line(end = [5, 0])
  |> line(end = [0, 10])
  |> bezierCurve(control1 = [-10, 0], control2 = [2, 10], end = [-5, 10])
  |> line(end = [-5, -2])
  |> close()
  |> extrude(length = 10)
```

![Rendered example of extrude 0](data:image/png;base64,[encoded data, 80736 characters])

```kcl
exampleSketch = startSketchOn(XZ)
  |> startProfile(at = [-10, 0])
  |> arc(angleStart = 120, angleEnd = -60, radius = 5)
  |> line(end = [10, 0])
  |> line(end = [5, 0])
  |> bezierCurve(control1 = [-3, 0], control2 = [2, 10], end = [-5, 10])
  |> line(end = [-4, 10])
  |> line(end = [-5, -2])
  |> close()

example = extrude(exampleSketch, length = 10)
```

![Rendered example of extrude 1](data:image/png;base64,[encoded data, 84700 characters])

```kcl
exampleSketch = startSketchOn(XZ)
  |> startProfile(at = [-10, 0])
  |> arc(angleStart = 120, angleEnd = -60, radius = 5)
  |> line(end = [10, 0])
  |> line(end = [5, 0])
  |> bezierCurve(control1 = [-3, 0], control2 = [2, 10], end = [-5, 10])
  |> line(end = [-4, 10])
  |> line(end = [-5, -2])
  |> close()

example = extrude(exampleSketch, length = 20, symmetric = true)
```

![Rendered example of extrude 2](data:image/png;base64,[encoded data, 94352 characters])

```kcl
exampleSketch = startSketchOn(XZ)
  |> startProfile(at = [-10, 0])
  |> arc(angleStart = 120, angleEnd = -60, radius = 5)
  |> line(end = [10, 0])
  |> line(end = [5, 0])
  |> bezierCurve(control1 = [-3, 0], control2 = [2, 10], end = [-5, 10])
  |> line(end = [-4, 10])
  |> line(end = [-5, -2])
  |> close()

example = extrude(exampleSketch, length = 10, bidirectionalLength = 50)
```

![Rendered example of extrude 3](data:image/png;base64,[encoded data, 87328 characters])


