it's a chess set in the shape of a rook.
best is to print the board out of tpu. that way it can handle the bending.
you can also print the board out of hard plastic with the sepperate pieces.
EDIT: (sorry about the print orientation. i will also fix that in a later upload)
i have made a less wastefull version of this.
this is just a quik upload for that purpose. i will still eventually make a more estetic look to the outside.
WARNING i have not printed it yet., so i am not sure if the board will fit in the case.
there is a file for sepperate board pieces in the legacy folder.
just print it as is.
pause it at the moment you want the pieces joined together and then use 2 bands of thin cloth along the width of the board (over the gaps). make sure it's tight and flat.
and then continue the print. it will fuse the cloth into the print and you will have an articulating board
i currently don't have time to design a better board. (plus i still need to figure out how exactly the sheet metal enviroment works so i can bend and unbend the board so it will deffinatly fit the case)