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I think it depends on the use case. If the plastic is used in a container where food will be in constant contact with it and for extended periods of time, then yes, many plastics are not safe. Pure PLA is relatively safer in comparison to ABS for example. ABS is not only unsafe, its particles taste and smell awful. I know, because sometimes I had to sand the printed items and I end up tasting some particulates in the air. :( Really bitter stuff! Now, back to the faucet aerator case, I think here the water is only momentarily in contact with the plastic. Plus any particulates would have been flushed away through time and use. However, I do agree with the possibility of bacterial contamination. And this is not just with the 3d printed aerators. Even with off the shelf bought aerators, we should be cautious about drinking water straight from the faucet. I remove the aerators and clean them at least once every year. I have to tell you the sight is not pretty. They are always full of visible mold, not to mention invisible bacteria. Therefore, I always filter and boil my water before drinking.