This chess set is compatible with human army.
https://www.cgtrader.com/3d-print-models/games-toys/board-games/fantasy-human-army-chess-set-2
The size of king is about 115 mm * 55 mm. If you use FDM printers and 100% or bigger, use supported files. They have in-model supports for better qualities. But supports in slicer are still needed.
If you use resin printers or scale smaller, use files without in-model supports.
And customizable chess board block is included. I will add better chess board soon. Have fun ;)