OnStep is a computerized goto system, usually for stepper motor equipped mounts though any step/dir interface motor driver (including servo) should work.  It was designed, from the beginning, as a more or less general purpose system and provisions were made in the firmware to allow for use on a variety of mounts including Equatorial and Alt/Az (GEM, Fork, Dobsonian, etc.)  It uses an LX200 like computer command set with a few extensions to suit hand controller-less operation. (Quoted from the original site.)

[https://onstep.groups.io/g/main/wiki](https://onstep.groups.io/g/main/wiki)

How to make it!
[https://mr-deep-addicted.com/?p=1873](https://mr-deep-addicted.com/?p=1873)

*Written in Japanese but you can change language setting.

I uploaded also Finder Arimizo Attachment Thin Type for Keen-One EQ.
[https://www.printables.com/model/273812-keen-one-harmonic-drive-eq-mount](https://www.printables.com/model/273812-keen-one-harmonic-drive-eq-mount)