Bought these to replace my old Prusa i3 top bearings and upgrade to a 4 bearing setup. I read the negative reviews but thought I'd give it a try anyway. My mistake. I've found that 1 out of 4 missing balls in the bearing causes major stuttering issues - it's completely useless. I think with at least 3 workers I was able to get my printer working again. 2 stars because the workers work quite well.
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