Shrink Fatten

Reference

Mode:Edit Mode
Panel:Toolbar ‣ Tools ‣ Transform ‣ Shrink/Fatten
Menu:Mesh ‣ Transform ‣ Shrink/Fatten
Hotkey:Alt-S

This tool moved selected vertices/edges/faces along their own normal (perpendicular to the face), which, on "standard normal meshes", will shrink/fatten them.

This transform tool does not take into account the pivot point or transform orientation.

Offset Even S, Alt
Scale the offset to give it a more even thickness. A greater offset factor is obtained vertices, which share faces, forming a more acute angle.
../../../../_images/modeling_meshes_editing_transform_shrink-fatten_before.png

Mesh before shrink/flatten.
../../../../_images/modeling_meshes_editing_transform_shrink-fatten_inflate-positive.png

Inflated using a positive value.
../../../../_images/modeling_meshes_editing_transform_shrink-fatten_inflate-negative.png

Shrunk using a negative value.