Fig. 4.

Various 3D printing technologies available for manufacturing. a The process where a stereolithographic printer cures resin with light. b The process where a laser sintering printer fuses powdered plastics in a bed to form objects. c The process where a fused deposition modeling printer creates objects by melting plastic filaments retrieved from a reel. d The process where a metal printer uses an energy source to fuse metal powder into objects. Reprinted with permission from Materialise [114], Copyright (2020) Materialise