I've tried and tried and TRIED to get these nozzles to give me decent results but to no avail. I've tried 0.4 and 0.6 jets and there is something wrong with them because they give terrible results at settings that my other jets work well at. Even a 25% reduction in flow, a temperature drop of 10°C below minimum and 8mm of retraction on DIRECT DRIVE were not enough to achieve anything remotely acceptable results in the baseline retraction test. Unfortunately, I was just outside the window to return these tiny poops, so I'll have to eat up the price and send them to the landfill where they're supposed to be, or find some other use that doesn't require wasting time, money, or filament by putting them in install a 3D printer. After I posted my issues on r/FixMyPrint, many others said they had the exact same issues with the same product, so that doesn't mean I got a one off bad batch. Save your sanity and get something else.
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