... 4.free shipping plastic cnc prototype, rapid prototype, cnc stainless steel prototypeGeneral Feature: 1.Prototyping Way:CNC/SLA/SLS/FDM/ ... Way Material Tolerance Stereolithography (SLA) Technician's Choice, Semi-Flexible, PE-Like Durable, PP-Like,ABS-Like High-Impact ... ,PU and so on+/- 0.003" Metal prototypes Aluminum, Stainless Steel, Carbon Steel, 17-7 PH, Brass, Phosphor Bronze, Copper, Nickel ...