Well, you can rule out your computer. I suggest changing the USB cables. You'd be surprised at how many times just changing the cable solved the most otherwise unsolvable problem. It's simple, cost nothing if you have another lying around and may be effective. If it's not the cable, it's something up the line that's going to involve more expensive parts. Good luck!
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2013 PRS 96x60x12 (Centroid upgrade)
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12" indexer
Aspire
Rhino
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Prusa MK3S+
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