A rather simple dice tower with two stairs ending up on either side of the model. When printing the DoubleHelixStaircase.stl, the DoubleHelixStaircaseWall.stl can be seen somewhat like a reference protective wall, and can be modified or replaced with a similar model to your liking.

Test print at 2/3 size (for mini dice) on Bambu Labs P1S with .04 mm stainless steel nozzle and .2 mm layer height, no supports and at full size with same configuration. One of the sides seems to be better at ejecting the dice than the other.

DoubleHelixStaircaseSolid.stl is untested.