Saiper Flexible Couplings 5mm to 8mm (5pcs) Aluminum Alloy Joint Connector Compatible with NEMA 17 Stepper Motors, RepRap 3D Printer or CNC Machine, 3D Printer Accessories

I picked up a Voxelab Aquila X3 just after Christmas and love the printer, but I had issues getting the z offset adjusted, every time I would try to do it live during a print, the z-axis would slip and the nozzle would dig into the print bead. I purchased this when I finally figured out that the z screw was slipping in the coupler. My printer is now printing smooth layers and there are no variations in the layer lines. As long as it lasts, I would have gladly paid this for 1 of these, but I'll gladly stow away the other 4 just in case.

The INCLUDED 5pcs couplings work very well. The High Quality Manufacturing and accurately measured I.D (Inner Diameter) are just that ACCURATE. I experienced NO problems using these couplings. They are also flexable which really helps maintain important needed central points especially with actions such as a rotation. Great product with more for extra being that 5 are INCLUDED

These stepper motor shaft couplings work great. Make sure you know your shaft sizes to use them as shipped.If you have a light drill press you can drill the hole size out to fit a shaft that is not an exact fit to the coupling.I will purchase this item again for future projects.

Some don't like this style as it could provide some flex in the z direction but an old trick makes these perfect. By putting a small ball bearing (1/4") inside, the vertical movement of a shaft is cut to 0. No more movement in Z only small flex is x and y if needed.

I use these to convert from a small motor with 8MM shaft down to 6mm drive rod. Arrived well packaged and in excellent condition. Will order more as needed.

good product, as described

This is a not-so-common parts that I absolutely needed, and the price was good.It is working good.

Set screws don't reach through because the holes aren't tapped all the way, so these are totally unusable.

Good