This is a multicolor chess board with a recessed knight symbol on the back, separated into components for easy color assignment in your slicer. It can slide into a matching divided box that can be used to store chess pieces, in which case the knight symbol can be put on top for an elegant chess box.
The chess pieces in the photos are from https://www.printables.com/model/959776-multicolor-spiral-chess-remix. I've added a model of a template that can be used for cutting foam so it would match these pieces, as shown in the pictures.
Printing tips:
The graphic of the knight piece is from https://www.pngegg.com/en/png-zgycb/ which indicates it is allowed for non-commercial use.
The design is somewhat inspired by https://www.printables.com/model/460618-chessboard-with-box.
The author marked this model as their own original creation.