*2.2. Inkjet Printing*

The inkjet-based non-contact printing technology reproduces digital patterns with tiny ink drops through thermal, piezoelectric and magnetic approaches. The thermal stimulation, reaching until 100–300 ◦C, nucleates a bubble and directly leads to droplet expulsion from the printhead. The size of droplets is related to the temperature gradient and ink viscosity employed. Likewise, the ink drop generation can be produced by the pulse strain and acoustic waves generated from a piezoelectric actuator and larger size ink droplets can be produced by means of electromagnetic filed [51–53].

**Figure 3.** Schematic illustrations of the most diffused 3D printing fabrication techniques for porous scaffolds manufacturing: fused deposition modeling, inkjet printing, electron beam melting, selective laser sintering, stereolithography, electrospinning, two-photon polymerization.
