Not so good
5/5
These things rotate off kilter. Tried with old and new lead screws, and a new stepper - not sure if I got a bad one, but the default couplers rotate perfectly concentric compared to these.
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XB clamping flexible coupling 5mm shaft to 8mm screw.
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Buy a spider shaft flexible coupling from #Spool3D for your 3D printer in Canada without the surprise cost of the exchange rate!