Very well made and useful set. I used to try 0.3mm needles for my printer's 0.4mm nozzle and found them to be too loose (I'm new to 3D printing but clogged the nozzle by messing with the settings messed around and switched back and forth between PLA and PET-G ) ). These are true to size and fit perfectly. Note that low quality bits can vary in bore diameter, however this is not a problem with this kit. I have a few spare 0.4mm bits from different manufacturers and the hole in some of them (about 2 out of 10) is small. Needles do not pass them, but as I said, the reason is the quality of the jets. The original nozzle in my printer is absolutely compatible with the needle. I think I can also use these needles to separate the good spares from the bad. Tweezers are very good for this. The ones that came with my printer are flat and these are pointed which is useful sometimes.
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