Back about 1998 I was shown a Skull that had been made at the Polymer dept at Queens University Belfast from a CAT scan. It was made to allow the surgeons to work out the best way to get to a tumour.
Since then I've seen various widgits in both Metal, Plastic and in one case a machine that built up cardboard layers similar to 3D jigsaw/models. The cardboard was glued so that a solid model was built.
Not sure if it ever came to pass but there was talk of using a 3D tailoring scanner to make icing sugar models of the bride and groom for posh weddings!
