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）

Needes for 10mm stepper shafts amd 1605 ball screws.

Just what I was wanting

These are bored off center and wobble all over the place. There is noway they will work on a CNC printer. I would not purchase these at all.

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.

Good product

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.

I purchased a cheap flexible shaft coupling for a home made CNC machine and broke it within 2 weeks. I replaced with these more expensive coupling with a different design and these work great even when upgrading my motor from N23 to N34 size. Is still working 6 months later with no problems.

Works well on Z-axis lead screw for my Ender 3, and is a definite upgrade to the stock coupler. The finish is decent, and seems pretty solid. My only complaint is that the coupler will come apart fairly easily if you apply any form of tension pulling on the coupler, which can get very annoying if youre used to pulling up on the X-axis gantry to manually raise it. Thats 100% a design shortcoming specific to my application, and not a fault from manufacturing.

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

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