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）

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.

Good quality, much better than stock couplings.

After 3 months of lite use, they completely separated. The rubber-type press fit seems to be dried out and has lost its flexibility.

I felt that these were too tight to fit the shaft on NEMA motor (without forcing), and they are really tight - not sure I could get them loose if I had to after seating on the motor. However, after comparing overall performance with several other couplers, Ive decided I prefer these. Hopefully I can avoid needing to remove these from the motor (often enough to make cost an issue at least).

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!

These coupling did not last thru the first minor jam on m Tops cnc

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

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

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.

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....