To produce investment, casting die or moulds are required to create the wax patterns that will eventually be coated in a ceramic shell. These dies are typically made of metal, such as aluminium or steel, and are precision machined to create the desired pattern.

The die is first designed with extreme precision to ensure that the wax pattern produced by the die is accurate and consistent.

Investment casting dies can be expensive to produce due to the complexity of the shapes and the need for extreme precision. However, once the dies are created, they can be used to produce large quantities of wax patterns, making investment casting a cost-effective manufacturing process for high-quality, complex parts.