When it is running, this motorized projector mount swings a compact white projector from a side-angled position around to face the viewer, and the turret provides yaw, tilt, roll and zoom axes, four degrees of freedom in total. A projector sitting on a moving pan-tilt base is not something you come across often, and the motion demo makes a strong case for the idea.
The mechanism is a 3D-printed pan-tilt turret assembled from parts in white, black, magenta, bright green and blue. The lower rotating section houses the internal wiring, ribbon cables and circuit boards, and a multi-jointed vertical guide arm runs along the left side. The projector housing carries the GROVIEW name debossed into it.
The maker describes the build as something done for fun and as an excuse to work with a multi-degree of freedom system, and it clearly became a learning project: I2C, actuators and universal joints all came up along the way. The piece that took real effort was the linear rail and universal joint in the center. In my view that center assembly is the part worth studying closely if anyone wants to attempt something similar.
One thing is still open. The focus knob on top remains manual, and the maker intended to add a motor to it but did not get that finished. The project was meant for home decoration, and the final spot shown for it is in the upper left.