“…3D printing represents, indeed, one of the pillars of the so-called “Fourth Industrial Revolution”, together with smart sensors, nano(bio)technologies, quantum, immersive, cloud and ubiquitous computing, the “Internet of Things” (IoT)/the “Industrial Internet of Things” (IIoT), blockchain technology, next-generation telecommunication networks, Big Data Analytics and Artificial Intelligence-based approaches and algorithms, such as deep learning [ 3 , 4 , 5 , 6 , 7 , 8 , 9 ].…”