Take my advice: Heat the hot end to swap out the nozzles THEN turn off the printer. The wrong key when it's still on will cause the heater element to fail, forcing you to get a new hot-end assembly like this one. Why? You can replace the element and resistor, but for the price you now have a spare that can be quickly replaced should anything go wrong in the future, and be back in business while you fix the broken one. I'm very glad my $30 printer is back and running better than ever with new fans as the original parts that cool you down were always noisy when it was cold.
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