Extrude Along Normals
Modify > Extrude Along Normals
 

Description:

      The Extrude Along Normals (Modify > Extrude Along Normals) command is similar to the Extrude (Modify > Extrude) command, except that each face is extruded in the direction of its own normal. An interactive tool allows you to control how far out the faces are extruded. When the command is first called you can drag the mouse without clicking to perform the extrude.  You can click and drag additional times to further adjust the extrusion length.  Press Enter to exit the tool and complete the extrusion.
    You can access the Extrusion Options dialog (Modify > Extrude Along Normals > ...) to toggle whether the extrusion will extrude adjacent faces together or separately.  This can also be toggled with the command Extrude Faces Together Toggle.


Notes:

- Extrude Along Normals can only be performed on faces, while Extrude can be performed on faces or edges.

- You can flip a face's normal vector using the Reverse Normals command (Modify > Reverse Normals).