So you would like to build expressive robots? The Creature Head open animatronics kit is worth a look. It has 2 DOF eyes and jaw that opens and closes. You get laser cut and 3D printed parts, servos, NodeMCU, breakout board, Wii controller, and other parts to get started.
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You can customize the parameters and make different heads to try these on. Costs $150 at this time.
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