screw prototype 1.CNC,SLA/SLS/FDM/precision ... 4~7delivery time 4.0.02mm tolerance pcb prototype,screw prototype, metal prototypeGeneral Feature: 1.Prototyping Way: ... PA66,PMMA,PVC,PVE, aluminum Zinc alloy, copper, iron, steel. +/- 0.005" Fused Deposition Modeling (FDM) production-quality ... so on+/- 0.003" Metal prototypes Aluminum, Stainless Steel, Carbon Steel, 17-7 PH, Brass, Phosphor Bronze, Copper, ...