A fun donut with "holes" inside to play with ... Printable on MakerBot Rep2 with standard settings You can print the donut and one or more "holes" which spin inside it together or separately. (If separately, you can make the holes different colors.) When printing the donut, pause after about 50% and insert the holes, then resume printing. You may have to clean some of the burring on the inside of the donut with an x-acto knife to allow the holes to spin around freely. Enjoy!