Othello/Reversi piece halves.

I designed these to be a close as possible match to the shape and feel of the original pieces, and added a space to hold 2x10mm cylindrical magnets within.  

When including the magnets, the stack becomes rather fun to play with in a fidgety way, helps keep them together and also allows for game play on magnetic surfaces like refrigerators and the like.

To keep the thumb-divots in the pieces smooth, I printed these with a 0.25mm nozzle and used a 0.05mm layer height with PLA on a smooth PEI buildplate, but have had reasonable results with larger layer heights.

You'll need 64 prints in each of two contrasting colors and 64 magnets if you choose to include them. The tiniest drops of CA glue do the trick, and including magnets greatly helps with aligning the halves.