Take a chassis layer and place it onto the robot and then screw in the two brass standoffs (Figure 2.12):
Figure 2.12: Connecting the middle chassis. Image courtesy of Adafruit Industries (https://www.adafruit.com); Image credits—John Park
Attach the four brass standoffs to the middle chassis layer (Figure 2.13):
Figure 2.13: Connecting the brass standoffs. Image courtesy of Adafruit Industries (https://www.adafruit.com); Image credits—Tyler Cooper
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