In some cases, the product that you want to manufacture and market doesn’t need to be produced in large quantities, or you want to do a first production run.
The speed with which a product reaches the market is an essential factor in determining how successful it is. In this regard, additive manufacturing lets you produce parts with final materials (ABS, PC, PC-ABS, Nylon, ULTEM and others) and professional finishes in a matter of days. This way parts can be provided before beginning mass production.
If your end-use parts are manufactured using an injection mould, any kind of significant design modification will mean you need to manufacture a new mould or make changes to the existing one, something that takes time and money. Additive manufacturing, however, gives you total freedom to design new parts without being tied to the injection mould.