Befenybay 2PCS 5mm to 8mm Aluminium Plum Flexible Shaft Coupling D20 L25 Connector Flexible Coupler for 3D Printer CNC Machine and Servo Stepped Motor（5x8mm）

I installed these and noticed it wobbling immediately when rotating the z lead screw. So I reinstalled these in several different ways (loosening/tightening grub screws, reseating coupler on lead screw then on motor and vis versa, and tried correcting uneven coupler by taking it apart and assembling it in different ways). I looked up and watched several different videos just to make sure I wasn’t installing these wrong. Nothing worked. After spending several hours on this coupler, I reinstalled the stock coupler and wobble is completely gone. I really wanted this coupler to work but in the end I had to accept that this coupler is poorly built. I will be returning and looking for a better built coupler than this one.

Works great for my Wanhao clone, the monoprice maker select plus

Works as should

Hello.... Ware schnell angekommen..... Ware sofort verbaut und für tiptop befunden Thx

To be fair I didnt try to adjust the cheap ones that came on the printer, or re-seat them in any way, but removing the original ones and installing these got rid of all the low pitch squeaking I got when rapidly adjusting the z health on my Cartesian printer.

Needes for 10mm stepper shafts amd 1605 ball screws.

They seem to work. Hard to test it. You have to take the Z rods out all the way to get it to go in. But thats a good time to clean them. The fitting is very loose at first and the screws are very hard to turn. I thought I was going to strip it. Then finally it turned and tightened. I thought I had the wrong size at first.

5mm was small. Had to drill it out a little bit.

Quality of coupling itself and screws is really bad. I would avoid as it is not worth the hassle of ruining your motor is the coupling seizes and you are unable to get it off.

The machining is horrible. I dont know if its made of aluminum or plastic.