Use M3 threaded rods and nuts to connect to each other... The battery holder is installed in the center. Print 6 sets of leg groups and 2 sets of cross bracket groups. The motor is optional, a 1:100 ratio 6V reduction DC motor. You need to cut a 6x3mm pipe to a certain length to clamp the motor bracket. You also need a large amount of plastic lubricant. The legs are connected together using M3 x 12 mm hexagonal nuts and bolts. You need 5 or 5.5 mm brass or PCB spacers for the leg pivot.