Uxcell Brass Knurled Threaded Insert Nuts 100PCS - M3 x 3 mm Female Thread (Pack of 100) Review

More than half of the goods I bought were deformed in some way. From this half, some of them could be saved by tapping them through, but many of them were drilled far enough off center to penetrate the barrel wall. Essentially, you pay for QA bounces. Next time I will buy my earbuds from a different source.

They did their job but as another reviewer pointed out about 25% to 50% of the batch is unusable due to being significantly out of round, the Thread is poorly finished or there are protruding burrs that can be removed with a file, but that's a huge waste of time. Still a good price if you consider it as a quantity of 50 instead of 100.

This product was purchased for use with 3D printed parts where there is not enough room for thicker M3 threaded inserts. Unfortunately, although the seller advertises a pack of 100 inserts, I estimate that only half can be used. The rest is broken, bent or somehow poorly made. On the plus side, the price was so low that only 40-50 viable stakes are still acceptable, even if they don't earn good grades.

Added PETG printing. Have used 32 so far and all 32 threaded well and looked good. I screwed up a bit with the first one, didn't realize they heat up so quickly but it's still good. I don't know why everyone is complaining about the wrong threads and needing to be cut. I suspect this is the method to install them. I used a 30mm M3 screw to mount it. Screw it onto the top of the screw, heat it up, stick it into the plastic and hold it there until it cools, then just unscrew the screw and do the…