Sculpfun S9 crash

Check if the entire mechanical part is clean and flowing smoothly, check if the cables are neat (tap them with a tester), and if the connections are good. If everything is normal, please check the calibration of the two A4988 current setting adjusters on the board.
Just to give a few examples... Before deciding whether an engine is responsible, various factors need to be evaluated. In fact, if it were up to me, I would never question them.

• Rajiv001

  : The problem has been solved, and you are right. With courage, I opened the handcart and discovered a defect. I found that the given distance between the pulley and the frame was very narrow; I loosened it by a quarter turn, and miraculously, everything finally went smoothly. thank you.