This is a 3D fractal sculpture with a distinctly organic look and feel. In your mind's eye it could be an exotic shell from unexplored seas, a mysterious magical talisman...or maybe it's just an interesting chunk of eye-candy. :) Feathery shapes fanning out along the top and bottom edges, swirling into graceful forms closer to the center.
This is a solid model and re-sizes well. I've printed this file in PLA at 54mm up to about 320mm across. The full version will need supports - lots of em. :) Not and easy print. I had good luck using Cura's Tree supports. The full version is slightly flat on the bottom in hopes of keeping it stuck to the build plate. :) First few millimeters can be tricky with many small areas on the plate. The split version is much easier to print, but still has some overhang that will need support.