checkers piece

Yet another checkers (drafts¹) piece. This one should work nicely with 42 mm squares on the board.

This includes a token to mark a king (dame, promoted piece). Either use two tone printing to get some contrast for the tokens, or use 10 eurocent coins. The recess is sized for those.

There is also a variant without the recess, for X Men’s Morris.²

The board in the picturesi s the [puzzle chess board](https://www.thingiverse.com/thing:1505544), scaled to get 42 mm squares.