the pure metal onesreally*have my interest; I'm waiting for them
  to mature as well, although I'd be happy with the little one
  they sell that looks like a toaster oven.. But I can wait. *I'm
  learning what I can about it here and there, so that I'm ready.
  We're very close to being able to move your phone/tablet around
  the room as it converts into voxels, then having it stream to a
  3D printer printing out a 3D map of the area that's, say, Lego
  size. We have all the parts to do it - I'm just waiting for
  someone to come up with the idea that has access to the tools
  needed. *Can't wait :D