How fast does PLA absorb moisture

Help with printing with specific plastic filaments.
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How fast does PLA absorb moisture

Post by penn1793 » Mon Jul 15, 2019 2:27 am

I bought some PLA filament from Matterhackers a few weeks ago. It printed perfectly without any issues on my TAZ 5 Aerostruder. About a few days ago I printed some objects with some PETG filament. I had to take apart the toolhead to clean it and put it back together and it seemed to work with my PLA filamt, but will jam anywhere from a few minutes to a few hours after the start of printing. I did not change any setting on the printer so the only thing could be moisture absorption. However, I live in a dry environment that is between 20 to 30 percent humid. Can this jam be caused by the filament absorbing moisture or could it be something else?

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Re: How fast does PLA absorb moisture

Post by nopick » Tue Jul 16, 2019 6:53 am

If your humidity is that low you are not likely to have moisture problems with PLA.

How much disassembly did you do on the toolhead and hotend to clean it?

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Re: How fast does PLA absorb moisture

Post by JoeBowler300 » Wed Jul 17, 2019 11:14 pm

When I switch from PetG back to PLA I load it at 230C and extrude it until PLA comes out, (usually liquified). Perhaps you still have some PetG still in there? I would also suggest doing that and cool it down to 160c then retracting it. 60mm seems to be a good number for this. Thinking this action that some reminant PetG will cling on to the PLA as you retract it out. I assume the aerostruder print head works the same on the TAZ 5 as it does on the TAZ 6. I also recommend using a silicone soc on it.

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