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in contact with Filament

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Remnants from other plastic that you've run through the printer (all machines are tested before being shipped out). Contaminants in the material you're using. Dust. Random oil/grease from the machined parts. Oil from the bearing inside the feeder, ground down parts of the plastic housing of the feeder (can't remember the type of plastic used at the moment, it's not ABS). Whatever the guy/gal had on his/her fingers during assembly.

That's what I can come up with without thinking too hard on it. In other words, don't print stuff and put it inside people or use it with food.


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