I have several 3D printers using MK8 hotend These nozzles are of high quality and very accurate in nozzle diameter. I have used them on my Ender 3 and my Neptune 2. As with any hot-end nozzle replacement, be sure to heat the hot-end to around 200 degrees before removing the original nozzle and installing the replacement. I mean brass nozzles, but steel nozzles will work too. They say they last longer, although I have nothing to measure them against. I have yet to wear out the brass let alone the steel. It is equipped with glow-in-the-dark filament, which is said to wear out the nozzles faster. I haven't seen this problem. This kit contains needles designed to clean the nozzles from the thread. Be careful, they're sharp and I've pierced myself with them more than once. A wrench is a nice addition, but for me I have a socket that matches a screw handle that works best for me. All in all, this is a great set to have on hand. Worth the price. In my opinion it deserves a full 5 stars!
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