In AutoCAD 3D, the Extrude command is used to make a surface or solid from a 2D surface or a 3D curve. Consider the following illustration: The Extrude command is commonly used to make walls, shapes, and other objects.
On the command line, type Extrude and hit Enter. On the command line, type Mode or M and hit Enter. On the command line, type Surface or SU and hit Enter. Extrude the object you want.
Solid is the best option. Then, after selecting the object you wish to extrude, hit ENTER. The application will next ask you to choose the extrusion height, or you can select one of the other possibilities. Press ENTER after entering an extrusion height of 8 units.
On a 3D Solid Face, Extrude a Bounded Area:
Select the Home tab. Panel for modelling Presspull. Find.
To establish an offset direction, click a face on a 3D solid object and move the pointer in that direction. The edges of the faces that can be offset are highlighted.
To set the extrusion distance, type a value or click in the drawing area.
Tab into Edit mode after selecting your object. Extrude the vertices, edges, or faces that you wish. Ctrl+left-click the point where you want the extrusion to stop. Blender determines the type of extrusion you want and extrudes your pick exactly where you want it.