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Belt falling of of pulley

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The top belt is falling off the pulley when I print. This really effects my prints. Any way to fix this?

You can try tightening the belt, if that is the problem.

разобрать станок и собрать снова по инструкции. обычно помогает.

Is the pulley falling off or the belt falling off?

If it is just the belt then you need to put more tension on the belt and also ensure the pulley is aligned with the opposing pulley. You can check the alignment by loosening the pully on the motor (undo the grub screws) then sliding the carriage through its motion quickly multiple times to centre the pulley. Just make sure the motor is disconnected from the board when you do this as it can create a very high voltage back into the control board and cause a short circuit.