With the wooden and 3D-printed parts ready, we started assembly.

First, we built the spherical chessboard. We glued the four 3D-printed dome parts together using the built-in hinges and some epoxy. We inserted each square into its slot and added magnets so the chess pieces would stick.

Next, we put the cart together by installing the stepper motor, linear actuator, servos, and gripper into the 3D-printed body.

Then, we built the curved rail out of the laser-cut plywood layers, fastening them with M5 screws. We bolted the 3D-printed top and bottom supports in place using M8 bolts

Finally, we mounted the cart onto the rail and attached the bottom support to the wooden base.

This finished the mechanical build. Next up: wiring, programming, and testing.