Fair Spherical Dice

“Fair Spherical Dice” The concept behind this dice is quite simple; the outside of the dice is spherical (or as much as we can get with an FDM 3D printer), and the inside is cut out with a regular octahedron. The octahedron has 6 vertices which line up with the “faces” of the outer spherical dice. By placing a small weight inside (I used a 7mm ball bearing), when this dice is rolled, the ball bearing will always fall into one of the inner vertices and the opposite outer face will face upwards. I