Injections moulding is a manufacturing process for producing parts by injecting molten substance into a mold, or mold. Injections moulding can be performed with a host of materials mainly including alloys (for which the process is named die-casting), glasses, elastomers, fabrication, and most commonly thermoplastic and thermosetting polymers. Material for the part is fed into a heated barrel, blended (using a helical screw), and inserted into a mold cavity, where it cools and stiffens to the settings of the hole. Following a product is designed, usually by an business artist or an professional, moulds are manufactured by a mould-maker (or toolmaker) from steel, usually either stainlesss steel or aluminium, and precision-machined to form the characteristics of the desired part. Injection moulding is widely used for manufacturing a variety of parts, from the smallest components to entire body panels of automobiles. Advances in 3 DIMENSIONAL printing technology, using photopolymers which experts claim not melt through the injections moulding of some lower-temperature thermoplastics, can be used for some simple injections moulds.