The rotate tile has the paths of a DIC tile, but with a rotating disc under them which allows the side channels to change the middle path. The disc has holes in it to allow balls to fall through it when rotated, and other balls to roll over it if it is aligned properly. -- PRINTING - All models are scaled up 10x. Print one base, one disc, and two tops for each tile. An M3x6 screw and a washer is needed for each tile. To assemble, screw the disc onto the base with a washer under it, then glue the two tops on the base, aligned with the pegs on the corners.