After having an ideao for  the design, we began by working on modeling.
Starting with most crucial part: the chessboard, as it serves as the foundation for dimensioning other parts, such as the rail, gripper, and pieces.

According to our design, the spherical chessboard has a diameter of 20 cm.

For inspiration, as mentioned in our first log, we looked at Orb Chess by NKD Puzzle :

We first began modeling the spherical chessboard :

For ease of manufacturing, since the chessboard will be 3D printed, we designed it to be assembled from identical parts using m3 screws or glue. 

Since the sphere will be mounted on a threaded rod, we also manufactured this part to make the coupling.

Next, the squares of the chessboard
They are made to be inserted into the chessboard like a puzzle.

The squares haves holes for inserting magnets, this is how the pieces will be able to on the spherical chessboard.

Here is the fully assembled spherical chessboard.