Push Modifier

Modify panel > Make a selection. > Modifier List > Object-Space Modifiers > Push

Make a selection. > Modifiers menu > Parametric Deformers > Push

Tab panels > Modifiers tab > Push modifier

Tab panels > Modeling tab > Push modifier

Positive and negative amounts of push applied to an object.

The Push modifier lets you "push" object vertices outward or inward along the average vertex normals. This produces an "inflation" effect that you can't otherwise obtain.

Interface

Push Value—Sets the distance in world units by which vertices are moved with respect to the object center. Use a positive value to move vertices outward, or a negative value to move vertices inward.