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  1. Thanks gr5! Indeed it is the same issue. I connected a scope on the stepper and it really explains it all. scope image scope image Clearly the stepper driver is loosing the current driving sync when changing between the drive modes, exactly as the data sheets explains. I will change the resistors and hopefully it's all sorted. Big cheers!
  2. Hello all, I have recently purchased an used UM2, which has a weird issue with very slow XY moves. It appears that the movement is not continuous, but stops at certain intervals. This is also causing a kinda zebra effect on surfaces. I wrote a test g-code file for demonstrating the problem. It's got only one move, G0 F50 Y100. A video with very audible movement sound is here. Any suggestions would be very welcome. Thanks! //PMa
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