How to Extrude in AutoCAD: Step-by-Step Guide
In AutoCAD, use the
EXTRUDE command to turn a 2D shape into a 3D solid by pulling it along a path. Select the 2D object, type EXTRUDE, then specify the height or direction to create the 3D form.Syntax
The basic syntax for the EXTRUDE command in AutoCAD is:
EXTRUDE: Starts the extrusion process.- Select the 2D object(s) to extrude.
- Specify the height or direction of extrusion by typing a distance or dragging with the mouse.
This command converts flat shapes like circles, rectangles, or polylines into 3D solids by extending them vertically or along a specified path.
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EXTRUDE
Select objects: <2D shape>
Specify height of extrusion or [Direction/Path]: <distance or drag>Example
This example shows how to extrude a rectangle into a 3D box with a height of 50 units.
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1. Draw a rectangle using the <code>RECTANGLE</code> command. 2. Type <code>EXTRUDE</code> and press Enter. 3. Select the rectangle. 4. When prompted, type <code>50</code> and press Enter. The rectangle is now a 3D box 50 units tall.
Output
A 3D box with the base of the rectangle and height of 50 units appears in the drawing.
Common Pitfalls
- Not selecting a closed 2D shape: Extrude works best on closed shapes; open lines will not create solids.
- Forgetting to specify height: If you don't enter a height or drag, extrusion won't happen.
- Using 3D objects as input: Extrude only works on 2D objects like polylines or circles, not on existing 3D solids.
Always ensure your 2D shape is closed and planar before extruding.
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Wrong:
EXTRUDE
Select objects: <open polyline>
Specify height: 30
Right:
Close the polyline first using <code>JOIN</code> or redraw it closed, then extrude.Quick Reference
| Step | Action | Description |
|---|---|---|
| 1 | Draw 2D shape | Create a closed shape like rectangle or circle. |
| 2 | Type EXTRUDE | Start the extrusion command. |
| 3 | Select shape | Pick the 2D object to extrude. |
| 4 | Specify height | Enter extrusion distance or drag mouse. |
| 5 | Finish | Press Enter to complete the 3D solid. |
Key Takeaways
Use the EXTRUDE command to convert closed 2D shapes into 3D solids.
Always select a closed 2D object before extruding to avoid errors.
Specify the extrusion height or direction to control the 3D shape.
Extrude does not work on open lines or existing 3D solids.
Use the RECTANGLE or CIRCLE commands to create shapes ready for extrusion.