All extrudes from faces occur in a perpendicular direction from the

selected face (Figure 3.7).

Figure 3.7 - Extrude with a size of two

In case you want to extrude from an edge or vertex, you might want to

constrain the transformation to an axis.

3.2.1 Extrude modes

Besides the E key, you can also trigger the extrude using the options

from the Toolbar. There you will find four buttons with different types of

extrudes (Figure 3.8).