dice with 2 mm fillet and small ball that will print inside the dice. rotate the model to show the number 1 up so that the ball will be in the correct orientation. Once finished you can pop the ball free with a small poker tool through one of the holes. Enjoy or not the choice is yours and yours alone iykyk. The ball is difficult to print with bad cooling and to high of speeds. Print a pair to check for retraction issues. Follow the standard retraction test made for 10mm cubes.