A round to it
thingiverse
Sometime in the 1950's or 1960's Dr. Mary Stiller came up with the "round-to-it" and copyrighted several designs. She was a professor of plant biology and biochemistry at Purdue University and died in 2013. A very interesting and extremely hard working person she had a huge passion for life and chose plant research (almost no funds) over animal and medical research (plush with slush) because she "believed" . Pretty sure you won't be violating any laws by copying this coin-like design :). So enjoy... PS, bright colors of PLA accentuate the shadows and make this noticeable. Created in Openscad.
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