As many already know, prolonged exposure of PLA to humidity is bad, the best thing to do is to keep the PLA spool in an airtight (dry) container when not in use.
The PLA tub is especially handy for my case when I have long stint of printing using PLA (over a period of days or weeks). I could just leave the spool on the printer without the unwanted exposure to humidity.
Its made from an airtight food container (10" x 12" x 5.5"). With added desiccant (silica gel packs) to keep things dry, they can be seen at the bottom of the tub.
As for the filament spool roller, it's made from 6061 aluminum, and delrin, with 30mm bearings. There are many other (easier) ways to do this, this approach is just an excuse to give the lathe a bit of a workout
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