I created some elaborate surfaces to construct a better boolean


and it worked! Sort of. The first 11 worked, the twelfth created what must be a bug.

I've attached the .3dm, and as you'll see, the area where the lobes are have developed a pixelated half-covering that thinks it's part of the surface of my cup. I don't know where it came from, or have any idea how to remove it. Thoughts?