I would be interested if there was a 3D printer wizard who could make them up!! Probably illegal to do it though.......SI or Topps would probably have a conniption fit and then their Lawyers would have a field day!!!
Only if you sold it for a profit. If you made one for yourself, that should be completely legal. If you made a few for friends for the cost of material, they shouldn't have a problem with that either.
Now, if you claimed you had no idea where they came from, and they were made in a limited quantity, but you not only seemed to have an endless supply of them, you also had about 15 different sparkle and color variations, of which you were the only one in the world selling them, well that's a story we're all too familiar with. However, Topps doesn't seem to mind, but SI might.