This aluminum coupler is a standard replacement part for Creality CR-10, CR-10-S4, CR-10-S5, and Ender. If your printer suffers from repeated and regular shifts in layers, on almost regular intervals, inspect your coupler. Make make sure the grooves are thin and straight. If your coupler is stretched out, and elongated, from poor handling, or shipping damage, you should replace it.
This part is an authentic Creality factory component. Please note: they did offer some with a pinch screw, during early production periods. This coupler uses two set screws at each end. This coupler allows the open build wheels to do their job. Even if you Z rod is slightly off center, this style coupler is ideal. This coupler allows the center of the motor to be slightly misaligned with the z axis screw, and keeps your wheels, and your mechanics in line with the frame. Rigid connections are not a good idea!
One end has an 8mm bore, to fit over your threaded Z axis rod. The other end is 5 mm bore to pit over your stepper motor shaft.
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1 Coupler with set screws
TIP: It's easiest to loosen screws, and lift you Z-rod straight up. Lift it a few inches out of the top of your printer, to give you room to work. This is a very easy install. Be sure to leave a credit card thickness gap between the coupler, and your stepper motor. The threaded rod should be held by the top solid portion of the coupler only. Tighten screws well.