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 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

Na het veranderen van mijn Z as op mijn CNC had ik een andere koppeling nodig, nu heb ik er ook meteen eentje reserve.

The 5mm side for the stepper was to small. I ended up stripping the bolts to get it tight enough.

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!

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

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

Will separate when pulled. Doesnt help screw wobble, to stiff of nylon insert. Screws strip easily, wont grip shafts without a lot of torque.

Sort of small

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.

I can see where they have utility and where some people probably love them for certain applications, but I absolutely couldnt stand them at all. I bought a pair to use for an Ender 3 V2 printer when I was doing a dual-Z axis upgrade and just the littlest bit of pressure sent these couplers flying apart. For example, if you had even the slightest collision with your print bed, you were going to have to go in there and re-seat at least one coupler. And this is where I say I can see where they have utility for some people. I can see where that would seem like a perk to immediately limit the collision by disengaging from the drive train so you didnt smash your print head down into the print bed. But I found these would also separate during normal course of use causing inconsistent z-height adjustments on prints and horrible print quality. I went back to use the flexible aluminum couplers which are still fully connected but spiral cut in the center to allow for some margin of error in a collision, and flexibility for misaligned screw rods, but still fully connected with spring-back to ensure more consistent operation for long periods of time.