Benham's Illusion Top

See https://en.wikipedia.org/wiki/Benham%27s_top

I took the basic disk pattern from MosaicManufacturing's design, and merged with an "Inception" style top by Arun_H

I've liked Arun's split top design, though I struggle with tolerances around the center screw. Because of that, I shortened the screw by 1mm, tapered the ends, and softened the threads a bit.

Edit: I just added a new file "Top with Weights Resized" that has cavities designed to hold M10 hex nuts, to add weight around the pe