And it will be like a concrete mixer turning, it has to be smooth for 3D printing
The teeth on these ring gears are not even a true gear tooth profile, are not designed to be used as a gear as such,you should consult with gear manufacturers on how to do this to get zero backlash, I'm sure they would be all ears, without a split spring loaded pinion or gear, it is not possible to have zero backlash, if it was everyone would be doing it
The problem is with that gear ratio, and if the stepper is using 10 microsteps the motor won't have enough torque to drive it, or if it does won't be able to control it very well