I was hoping someone could tell me the outer diameter and the length of the X Y ball screw couplers. If not now, perhaps if you ever need to access one to re-tighten it.
Thank you
Hey tmuka, hey Tom @TMToronto,
Solved that one over a year ago 
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They’re very similar. The onefinity part has an additional hex set screw in each end to match the shaft’s “D” flat profile and resist slipping. The onefinity aluminum part finish is also shiny whereas the others are matte. In my experience, both types are compatible though. I replaced the X stepper on my wall mounted onefinity with the 3Nm variant that had a 10mm D shaft. (I also had to shorten the motor shaft length to fit in the space.
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