About to loosen everything up, hopefully it helps without having to re print the middle end.
Strange about the different sizes,. If it is the same thread size I would expect it to have the same OD. Guess not.
Edit: Dang, I knew this would suck. Because I ran the stepper extensions through the conduit I can’t take the center assembly all the way out. I decided I would do everything right the first time and soldered the extensions. I didn’t print the solderless mounts because I was planning on plasma cutting the motor mounts anyway. Guess I can’t change those out either unless I want to undo my soldering work.