Recent advances in 3D Systems Thermojet materials have led to improved accuracy of models. These wax models have been used as mandrels for electroforming EDM tools. The speed of production of the models, together with the use of low stress, thin walled copper electroforms allows the rapid production of prototype or production tooling. The paper discusses the metallisation process, factors in maintaining accuracy of reproduction of the final electroform, and the relationship between design, model, and final part accuracy.