“…As the technology matured, improvements in speed, dimensional accuracy and the development of new materials made rapid prototyping technologies progressively more suitable for the production of final parts (Gibson et al, 2010). Currently, AM is being integrated with other pillars of the Fourth Industrial Revolution such as the Internet of Things (Tolfree and Walsh, 2018). We distinguish between polymer additive manufacturing (PAM) and metal additive manufacturing (MAM) because of significant differences in the underlying science, industrial applications, market stakeholders, and level of maturity of the two technologies.…”