A forge is used for manufacturing products. Similar to twenty first century 3D printers, but can use any material required ... iron, copper, aluminum, carbon, etc., and build virtually anything as long as they have the construction template and needed materials. Some versions can be used as recyclers by breaking down waste and reusing the elements. These can also "mine" their own supply of raw materials by breaking down rocks. They come in various sizes, from small table top to warehouse sized. Power requirements are high, and a lot of heat is produced when they are in use.