DC stepper motors + gecko driver should be a cost effective solution. Define natural movements though. FYI. For example a head turn does not follow a single ax

DC stepper motors + gecko driver should be a cost effective solution. Define natural movements though. FYI. For example a head turn does not follow a single axis turn (around Y for example). Imagine a line drawn by eyes as head turns, eyes follow an arc. In fact, every single animal motion (human and other animals) follow an arc. First thing you learn when doing an animation.