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I will do more testing tomorrow. I stumbled upon the same resistor thing. But the values they used are for IRMS, so if our stepper has 1.5A Peak shouldnt it be 1.5A*0,707 = 1,06A rms, so that should fit for the 180mOhm rsense.. or not? And they recommend another thing somewhere in the datasheet. We shall use 0.5W rsense resistors, but my local dealer only has 0,25. Well, I maybe get a thermal imager next weeks so I can check if there are issues on my 0,1W resistors.