Table 2. Comparison of bioprinting approaches.

Bioprinting techniques	Viscosity/Material	Resolution	Printing speed	Postprinting viability	References
Material jetting	Low/Hydrogel: Alginate, agarose, gelatin, collagen, fibrin, HA, GelMA, PEG	10–200 μm	Fast	High	[67,70]
Vat polymerization	Low-High/ Photoinitiator and photopolymer GelMA, HAMA, PEGDA	5–100 μm	Fast	High	[76,77]
Material extrusion	High/Hydrogel: Alginate, agarose, gelatin, collagen, fibrin, HA, GelMA, PEG	15–400 μm	Slow	Medium	[81–83]

HA, hyaluronic acid; GelMA, gelatin methacrylate acid; PEG, polyethylene glycol; HAMA, hyaluronic acid methacrylate; PEGDA, polyethylene diacrylate.