PI Castings has its own facility for producing rapid prototype investment castings without the need for tooling. Investment castings offer complex-shaped parts produced with close tolerances, fine detail and a smooth surface. Castings are made in sizes from 5 to 600mm in a wide range of metals including aluminium, low alloy steels, stainless and tool steels, brass, bronze and zinc. Investment casting is suitable for general engineering industries, medical applications, defence and aerospace requirements. Customers’ CAD files are used to create wax models using a 3D printer, which are then used in the conventional âlost-waxâ? process to produce castings in aluminium, low alloy steels, stainless, bronze, zinc or any other cast metal.