Sears' "Craftsman CompuCarve" can carve complicated patterns in sylvan objects, according to SlashGear, kind of "a printer for wood" that even comes with its own software. (We seem to have a 3D scanner-printer fixation today, for some reason.)
Unfortunately, it's not the cheapest thing in the world, at $1,899. But think of all the money you'll be saving on your next TV alone. Maybe it'll work on pumpkins too.