Always buy injectors from trusted sources. I bought them because they are so cheap and seem to have good reviews. I was new to 3D printing and randomly ran into problems. I replaced my extruder, my motors, added auto bed leveling, replaced ALL HEAT, I even changed the nozzle a few times, everything seemed better after that, but not for long! After learning more and more and now trying jets from more reputable sources I can say with confidence that these jets are complete crap, I threw what I had left in the trash. They're so cheap because you have to replace them after 10 hours of printing! Do yourself a favor and buy some baits from a reputable source (I wouldn't recommend Revain at all, they tend to be cheap baits for the most part). TH3D or Fargo 3D printers have some great nozzles, but they don't come cheap. You get what you pay for.
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