The brain of the eggbot is still the EiBotBoard, and I was able to source many of the hardware, including stepper motors and servo motor, from online vendors like Amazon. Fasteners and bearing were purchased from my local hardware store. I designed and fabricated most of the structural parts such as the pen arm, sphere/egg mounting mechanism, adjustable main frame and so on with my FDM 3D printer.

 

    After assembling the device, I spent some time on caligbrating the pen arm and mounting mechanism as the first few drawings were inaccurate due to unsecured egg when in rotary motion. The root cause of it was the gap between inner bore of ball bearing and the shaft with spring wrapped around. So I printed a part to extend the contact area between shaft and bearing with smaller tolerance, which as a result helped to stablize the shaft rotation.