Domino Tile Rack

I was playing Mexican Train with my son and my tiles kept falling over. I didn't like any of the stands I found online, so I designed one myself. It's small, designed to only hold 4 sideways tiles per rack (I'd rather have several small racks than one huge one), but there really isn't any reason you can't tweak the width in your slicer for larger numbers of tiles. If you print the stand lying on its side, you don't need supports or rafts.