I bought these for my 3D printer overhaul. After reading reviews of the many bearings available here, I admitted that I had many concerns about getting defective or substandard parts that I would get stuck on, but in the end I decided that the potential cost savings were worth the risk . about the need to return them. And hell, I'm glad I tried them first. None of the horror stories I've seen in other reviews apply here. The bearings were not clogged with low quality grease, they came in a protective plastic box, all four are intact. They rotate silently on my X-axis, don't wobble and are very easy to install in the carriage. That's all I needed.
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