... , zinc,Brass, stainless steel,sheet metalFunctions of prototype(1) Inspecting layout Prototype is visible and tangible, which can reflect the ... avoiding "a nice design but an ugly product". So prototype is indispensable to developing a new product.(2) Inspecting ... plating, cadmium plating5) Powder coating Prototype methods:CNC/ SLA/ SLS rapid prototype*CNC rapid prototype.1) CNC machining for most type ...