Doughnut Bath Bomb Mold

My wife wanted to make doughnut shaped bath bombs but all of the ones on amazon are only half the doughnut. So, doughnut shaped bath bomb mold. Print 2 of the mold and 1 ring. Use your favorite recipe, put one end of the mold in the ring, fill the ring to the top with mix, then press the other mold into the ring. I printed at 20% fill and they hold up fine. She "iced" the doughnuts with soap.