The new upgraded nozzle was 100% needed and does the job, I now have perfect prints with no more issues and errors, my AD5X's have been running smooth for months as an owner of a 3d print farm you just cant afford to have machine out of action, this new upgrade was simple to install and fixed the print issues I couldnt be happier, glad to hear flashforge recognised the issue and resolved it. Keep up the good work flashforge. Looking forward to purchasing a few more of the best valued multi printer on the market.