Extrude Manifold

Reference

Mode

Edit Mode

Tool

Toolbar ‣ Extrude Manifold

Menu

Mesh ‣ Extrude ‣ Extrude Manifold

Hotkey

Alt-E

This tool is very similar to Extrude Faces but enables Dissolve Orthogonal Edges by default. This causes the tool to automatically split and remove adjacent faces when extruding inwards.

Example

Extrude Manifold Example.