Hi @MakeoutFuneral Sorry to read about the trouble. Based on your information, we have a few questions and suggestions for you to consider. First, did you replace both motors with ones that have the same specifications and parameters? If not, this could be causing the issue.
Secondly, it’s important to note that the SV02’s E-step is shared by both extruder motors, so you only need to calibrate it once.
Lastly, we recommend checking the voltage of the extruder motors on your measurement board. You can do this by using a multimeter, placing the red probe at the cross screw position next to the extruder motor driver (as shown in the reference picture), and placing the black probe in the SD card slot to measure the current voltage.
We hope these suggestions help you resolve the issue with your extruder.