Extrude is available in the 3D: Generate Pack.
The Extrude effect uses the shape of your Text layer as a source, and stretches it on the Z axis to create a 3D object.
- Depth: Sets the depth of the Extrusion, in pixels
- Face: Choose between Back, Front, or Front & Back to determine the direction in which the Extrusion will be generated.
- Internal Edges: This toggle determines whether internal edges of the layer will be affected by the extrusion or not.