I bought two for the Ender 3 Z Axis. One was silky smooth, the other was a bit scratchy and obviously had a slightly poorer finish on the rail. They're still smoother than the X-axis linear rails I bought from 3dfused, so I know they'll work. But buyers should still be aware that you may end up with an unusable option, resulting in a return to Reliabot in exchange for a different editing option: after some time with them, I can confirm that they're nothing but hot junk. They bind worse than the standard bindings and that's why I don't get reliable pressure from them. very disappointing
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