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）

Fit well but didn’t work as well as regular couplers. Rubber parts are not very flexible and there was still a lot of banding in my 3D prints with these. I had to switch back to normal couplers.

These work perfect for my 3D printer upgrade.

These work really good.

After a few uses the coupler was stripped and kept coming off the z motor.

Of the two in my package One is mis-sized and doesnt grip no matter how tight I put it. The other seems to be assembled with very poor tolerances as it wiggles and introduces artifacts into my system. Its not 180 degrees straight, more like 175 degrees.

hole was too large for my stepper. no matter how much I tightened it, it wouldnt lock down onto the stepper hex wrench eventually stripped from my trying to tighten

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

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.

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.

Holes out of alignment. They wobble. The hole for the motor is skewed enough to be visible. Probably done free hand on cheap drill press. I payed alot for quality got junk. Shame.