Final answer:
The statement is false; a base feature in 3D modeling can be created through various techniques such as extrusion, revolve, and sweep, not just extrusion.
Step-by-step explanation:
The statement "A Base feature is always an Extrude feature" is false. In the context of 3D modeling and CAD software, a base feature can be created using various methods, not just extrusion. Extrusion is one of the most popular methods of creating a base feature, but others include revolve, sweep, loft, and more. These different techniques can produce complex shapes and forms that serve as the starting point or 'base' of a 3D model.