This is another solution for the Truncated Sphere D8, different from the one based on a regular octahedron.
This die is inspired by the repulsion force polyhedra. In fact, the underlying polyhedron (not rounded) is a trapezohedron. It looks like the shape that can be obtained through this technique with 8 points repulsing each others. But in this case, I calculated the positions of those points to have a maximal radius for the circles resulting from the intersection of this underlying polyhedron with a sphere. The result is a truncated sphere with 8 circular faces of same radius.
This die is made of a shell of 1.5mm that contains support material to make it heavier. The engraved numbers have a 0.75 mm depth.