hi! I haven’t tried making using 8" but I did mine with 6" cake pans and the wilton ball pan. I have to tell you that the ball pan is 6" in diameter so it is not a perfect fit unless you carve the edge of your 8" cake. So for me, what I did was make 2 minions so I could meet the number of servings, and not compromise the shape of the character. Hope this helps :)
