Amazon Chess Piece (https://en.wikipedia.org/wiki/Amazon_(chess)) designed from a base model (https://grabcad.com/library/chess-knight-13).
The standard model (AmazonChessPiece4) can be used if you want less work, just print and it's ready to use.
The weighted model (AmazonChessPiece3_weighted) has a circular hole at the bottom for small weights to be placed. This model will provide a better feel in-game, but for it to work you will need to purchase small weights (e.g. https://shorturl.at/Akn0Y) and cut a velvet cover.
I also included the SolidWorks files I edited to make the parts, in case others want to modify them.