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Testing on an Anet A8 using PLA with 100% infill and a few dabs of white lithium grease. I had to heat up the shaft of a large philips head screw driver, taking a cigar lighter on the shaft to get the LM8UU bushing v3 to turn and expand a little more for smoother movement. I have some real drylin igus rj4jp-01-08 bearings for comparison. The movement on the real igus rj4jp-01-08 bearings can spin on the rod and slide back and forth with ease, one small finger flick and they should move to the other side. Once I got them heated a little to move better they seem pretty good. I will update in a few weeks after further testing .If I don not make an update ....they're probably working :)