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）

Good idea, I hope it works

Not much else to say other than these kept sticking on my dual z-axis Ender 3 Pro and causing terrible banding on prints. Woke up to a print I set overnight to see that one of them completely failed in the middle of the night and fell apart.

one bolt came jammed and the head was already cammed out, the second one didnt have the relief cut all the way through so tightening is impossible

I used these on my 3D printer and they work great. Excellent quality

Les flexi-coupleurs de ma LeadCNC, monobloc en aluminium casse régulièrement suites aux contraintes elevées en decoupe de bois dur. Ceux la ont lair plus solides, bien quavec un leger backlash qui nest pas geneant pour mon utilisation.

Works as should

I had to add a layer of aluminum foil around my Nema 17 stepper shaft to actually get it to bite tight enough to have a firm grip. They should design these things with a D-Bottom the same shape as a Nema 17 shaft so they will actually grab....

The pull apart, there is actually nothing that would keep them together. I installed them and not long afterwards, my printer would make some weird noise. Sounded like a door hinge that needed some form of lubrication. Took a few hours to locate the source. Turns out the piece of hard rubber, or whatever it is, in between the two metal pieces would cause the noise. Sounded really awful, like my printer would fall apart any moment. The Z lead screw(s) would sway like the Eiffel Tower. Thought my screw(s) were lose, hi, hi. So I checked them as good as I could and they ran true. Now I am using solid coupler and all is good.

Needes for 10mm stepper shafts amd 1605 ball screws.

All good as expected