Injection molding is a manufacturing process for producing parts by injecting material into a mould. Material for the part is fed into a heated barrel, mixed, and forced into a mould cavity, where it cools and hardens to the configuration of the cavity. Plastic Injection produces parts by forcing molten plastic into a mold where it cools and hardens.
Injection molding provides low cost at moderate to large quantities. This method of making plastic parts is an extremely versatile process for producing a wide range of parts with an excellent finish. Almost any 2D or 3D shape can be achieved. However draft is required in most cases as the shape must allow ejection from the mold. Side holes and even threaded holes are possible though they complicate the tooling.