Traditionally, the investment casting process uses a machined die to produce wax patterns for casting. 3D Hubs becomes the first company to use FDM castable plastic (PolyCast by Polymaker) to create these patterns. The benefits, besides its low cost, is that FDM printing allows for the production of large, complex patterns that traditional manufacturing techniques would have difficulty producing.
Metal Parts Now 5x Cheaper Thanks to New Development in 3D Printing Plastics
3D Printing / Additive Manufacturing, The Fastener Museum