You will only ever need one of these items (bearings can be replaced even if they wear out) so I don't know why sold as a pack of two. I think I'll buy another one on eBay? That oddity aside, it's a great addition to the Ender 3, as the out-of-the-box lead screw has an odd orientation. My Z movement is now smoother across the range as the screw is secured at both ends. Ten minutes to install and virtually "install and forget"; it's hard to disagree. Anyone want to buy from me?
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