This is pure rubbish. The bearings have incredible play. After 30 hours of operation, it was louder than the original proofer. The bearings then fail and create useless play. If you press them out and replace them with good quality ones, you'll find that the z and x bottom bracket bearing seats have internal burrs that prevent them from being pushed through. They are also pressed flush with the shoulder, which prevents a tool from grabbing the bushing and pulling it out. After 31 days, I have $110 worth of blue aluminum paperweights and a potentially recyclable stepper motor. Avoid it like the plague. I will NEVER buy any other Sainsmart product after this fiasco except maybe router bits. The fact that they make maintenance free bearings and don't choose quality bearings says everything you need to know about their ethos. Now I have to start from scratch. Thank you Saintsmart!
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