Bought while I was upgrading my 3D printer to linear rails. As with any linear guide components you buy online (except Hiwin or Steinmeyer), you'll have to disassemble them to clean them of shipping grease and re-grease them yourself. High-quality ball bearings and mounted on a Chinese rail without play and smoothly. Although many use silicone grease for these bearings, I would recommend using machine oil as it is a roller bearing. Using a good medium weight motor oil also works great which I've printed for about a hundred hours with no problems.
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