Fig.(6) Schematic diagram of 3D printing methods (a) Fused Deposition Modelling (FDM) or Fused Filament Fabrication (FFF) setup; (b) Powder bed fusion and Inject head 3D printing setup;(c) Stereolithography (SLA or SL) setup ;(d and e) 3D Plotting or direct ink writing (DIW) or Robocasting setup (courtesy of Ngoa et al. and Wang et al. [37, 44])