Apparently Qidi Tech monitors the comments on this site. I was trying to correct this issue before contacting Qidi Tech. They saw my post and sent me direct reply asking me to send them my address and they will send me a new hot end less the stepper motors. Within about a week I received 2 thermocouples, 2 heaters, 2 fans, 1 thermo brake (warm end), 2 thermo blocks (hot end), 2 - 4mm nozzles. I have to say they went Way above and beyond and didn't ask for a dime. I am thrilled with the machine and the customer svc. "Superb".