More and more suppliers are offering online customisation for various production technologies: 3D printing, machining, injection moulding, etc. Customers can, for example, upload a 3D product model and submit specifications to immediately receive a price quote and delivery time. This not only concerns companies with their own production capacity (e.g. 247Tailorsteel and Protolabs), but also online marketplaces with an extensive partner network (e.g. Xometry and Facturee). We call these new business models Manufacturing as a Service (MaaS).