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    One of the 50 questions in this topic

    How much do you know about Blender?

    What is 'extrusion' (extrude) in 3D modeling?

    Answers

    Create a new object
    Remove new faces, edges, or vertices from an existing selectionCorrect
    Smooth the surface of an object
    Duplicate an object

    Extrusion is one of the most fundamental modeling tools for adding volume and detail to a mesh.