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Low-Volume/Prototypes SLA Manufactured Plastic Prototypes SLS ZPrint FDM ProJet PolyJet Cast Urethanes CNC Machined Parts Sheet Metal Prototype Metal Casting Process Casting Tolerances Metal Casting 3DTouch™ 3D Printer Rapman 3.2 3D Printer Process Details Quality Control Lead Time Options Prototyping Sample Kit Casting Tolerances Prototype metal casting tolerances are as follows:   0.00" to 0.50"   -   +/- 0.005"    0.50" to 1.00"   -   +/- 0.010"      1.00" to 6.00"   -   +/- 0.015"      Each additional inch requires +/- 0.002"   Angles require +/- 0.5 degree     Across parting lines and cores require an additional +/- 0.01"  In many cases secondary machining operations can be performed to maintain closer tolerances if needed.