The first thing to consider is whether plastic is, or could be, the right material for your product. In addition, one must consider how many products are needed, and how complex the design is. In principle injection moulding is based on the following proposition: ‘The technically and economically optimal reproduction of complex 3D designed products that can be made from plastic’. On average, it is often only profitable to inject products from 3000 pieces, due to the costs of developing a mould.