Sorry NakedMoleRat - I missed this question. I had looked into getting them cast to make resin copies but I'm already so many hundreds of dollars down after commissioning the 3d sculpture, there's no way I can afford to front up the money for the materials, and labor required to make the molds and subsequent castings. What I like about the 3D printing is that each figure is identical with the same amount of clean-up required and there's little to no shrinkage and they can be printed indefinitely without needing to make a new mold once the first one starts showing wear from being used a lot.
Have you thought about casting the 3D print and making resin copies to bring the price down?