I find adjusting focus on the AE3 difficult due to my fat fingers getting in the view.
I have designed and printed a kind of a slip-on wrench to help with adjusting the lens:
The ring/wrench is intended to be removed after focus adjustment such as not to interfere with the TOF depth sensor field of view. It engages the tiny teeth on the lens rim with an internal spline. The wrench is slightly conical so that even if the 3d printer isn’t dead-on with calibration the wrench should fit at least part-way onto the lens and still grab the splines.
Design and print files available free of charge at:
https://www.printables.com/model/1876120
Enjoy 
