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）

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

Just what I was wanting

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).

These work really good.

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

worked as it should and am well pleased

Sort of small

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