There are seven main types of RP these include, Stereolithography (SLA) or Vat Photopolymerization, Selective Laser Sintering (SLS), Fused Deposition Modelling (FDM) or Material Jetting, Selective Laser Melting (SLM) or Powder Bed Fusion, Laminated Object Manufacturing (LOM) or Sheet Lamination, Digital Light Processing (DLP) and Binder Jetting.