Comment by zh3

A spinning mirror is certainly an option, there are many projects around using them as projectors e.g. [0]. It would need precision faces and be a larger volume than the flapping mirror approach. Because the mirrors are spring-mounted and designed to resonate at ~50Hz they actually take very little power to drive - there's an optosensor on the back used to stabilise the oscillation amplitude, which is why the VB and Private Eye display widths vary during startup.

Can't see the video from this location, so may be just restarting stuff in it.

[0] https://hackaday.com/2018/04/20/laser-projector-ditches-galv...