Hi
Since people with more filament knowledge than myself have not commented.
I’ll start.
Maybe someone who knows will chime in.
I store my filament in 5 gallon buckets with flower drying desiccant in an old nylon stocking.
I dry the desicant for 24 hours in my food dehydrator.
I put an inexpensive relative humidity gage inside the bucket.
After drying the desicant, I put my filament in the bucket and seal it up.
After about 4 weeks of storage, my relative humidity gage reads something slightly less than 15% humidity at about 70 degrees F.
This strategy appears to work for ABS, nGen, PLA.
My work area is kept at 50% relative humidity.
My mounted spool hangs in the open room for about 2 weeks at a time.
I’ve noticed that at the end of being open in 50% relative humidity that there appears to be more die swell,
but for my projects after 2 weeks hanging open, I put them back in the bucket.
I renew the desicant every 2 months or so.
…
BUT
For a material called PCTPE, things are quite different.
I have a sealed enclosure with spool mounted inside.
I dry the PCTPE spool in my dehydrator for about 2 hours
then, I dry my desicant for 24 hours and put it in the sealed enclosure.
My humidity meter after this process reads about 10% relative humidity or less.
I can print for about 1 week before the humidity increases to something slightly above 15%
Then I notice very much die swell when watching the extruder push some filament into the air.
I use very little PCTPE because what I usually build is made of ABS.
Nylons are fussy that way.
…
I’ve been looking for exactly the answer to the question you have posed.
I have never seen a straight forward answer.
In the end, It appears that If you are not having dimensional problems or bubbling of the filament
as it extrudes, don’t concern yourself too much.
…
I hope my rambling here helps you in some manner AND
I’m hoping that anyone with knowledge in this area will comment.
