I've been using these replacement hot ends on my Creality CR-10 for a while with mixed success. The last four I got are completely useless because the nozzles in ALL FOUR are 100% stuck and can't be changed. This is quite a problem as the pre-installed nozzles are oversized and prone to clogging, requiring replacement as soon as you open the box. A stuck nozzle I could understand. But completely stuck in all four hot ends? I spent hours disabling EVERY one of these attachments. I've tried both cooling and heating, cycling the machine on and off. Neither of them moved. Completely destroyed trying to take it down. I just pinched/cleaned the nozzle and left chips everywhere. I don't know if I'm missing something and those jets are permanent (which wouldn't make much sense), but I'm extremely disappointed. That set me back quite a bit in the work project. The ones I used to buy were prone to clogging, but at least they were serviceable. I literally can't even use it. Absolute waste of time and money. Really disappointed.
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