“…To produce a natural polymer as the material for 3-D printing, biological materials such as collagen, polysaccharides, gelatin, etc., was used to form a scaffold. One of the biggest advantages of using natural polymer is that the host tissue's extracellular matrix can be maintained [49] and low possibility of immune rejection reaction [50]. However, natural polymers often lack in mechanical strength hindering their applications that requires load-bearing.…”