I made a concept for a 2 axis smart camera powered by two 9 gram servos and a small stepper. The unit is built to allow Skype or hangouts calls to move into 3D or to be used as a smart security camera. Due to the compute power you could easily use open vision tracking software to make a smart camera for almost any other purpose you can imagine. The lack of slip rings limits the really life applications beyond small projects.
The camera assumes you are using a Raspberry Pi Zero, a stepper control board, a servo shield, and a raspberry pi official camera.
The threads will only work well if they are printed vertically going up and off the part.