Extrude Manifold

Reference

Mode:

Edit Mode

Tool:

Toolbar ‣ Extrude Manifold

Menu:

Mesh ‣ Extrude ‣ Extrude Manifold

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.

Exemplo

Extrude Manifold Example.