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.

My CNC came with solid aluminum spiral-cut shaft couplings. This lasted for quite some time but one finally broke. I replaced with flexible urethane couplings which are widely used in heavy manufacturing applications. I am confident this product will have a long service.

They would not clamp to the stepper motor shafts of my sidewinder X1 no matter how much I tightened the bolts.

I like these type of coupler alot better than the set screw type because the set screw type you can never get them exactly on center. with these friction type they stay on center and nothing damages the lead screw

works great for helping z axis stress. Printer moves much smoother now after this and a dual axis upgrade

Both of the ones I received were so tight, I doubt they would separate in the event of a nozzle crash. Ironically, the one I did use slipped on the motor side, causing a nozzle crash, despite being tightened to the point I was worried about stripping threads.

If your planning to buy this to solve z axis wobble, DONT! The hole is not centered and made prints come out worse than ever before! Poor manufacturing quality and not even worth $1 Look elsewhere!

Sort of small

Just what I was wanting

Der Kunststoff ist zu weich - und die Schraubenköpfe auch. Resultat: Man braucht viel Drehmoment um die Schrauben anzuziehen, damit die Kupplung nicht auseinander rutscht, und dabei macht man die Schraubenköpfe rund. Drei von vier gingen noch vom Schaft, eine nicht mehr und musste abgeschliffen werden. Für z.b. die Z-Achse an einem 3D Drucker wäre diese Schaftkupplung noch brauchbar, aber wer hat schon einen 8mm Schaft an einem Nema 17? Geht Retour.