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Alex, another question. In the tutorial, you show 2 pots (one on each side). Did you recently add the second pot, because my print of the dual head has only one pot, on the inside (right). What's the second pot for? I can just drill a hole for it. Also in the tutorial you do not list the type of pot. Could you identify it please?

BTW, I went with simply on-off toggle switches and one big on-off-on. I can add another on the side, but I need to add the pot(s) and then I can wire up to the arduino and move to the other side of the head....

Let me again congratulate you on this excellent work. Really, it is amazing and you should offer it as a product.