How to dry PLA filament

Dry PLA at 40–50 °C for 4–6 h.That is the consensus range from dryer and filament manufacturers — the exact same values the filament drying chart & timer uses, where you can start a countdown for this cycle. PLA is low — PLA is the most forgiving common filament, so expect moisture trouble after weeks of open shelf storage, not days.

Wet PLA symptoms

The symptom PLA shows most characteristically is a rough, fuzzy surface where the same profile used to print glossy and clean. Beyond that, the general wet-filament signs apply: popping, crackling or hissing from the nozzle as steam bursts out of the melt, stringing and oozing that retraction tuning cannot fix, a fuzzy or unexpectedly matte surface, and weak parts that snap along layer lines. If a spool that printed fine before storage now shows any of these, dry it before touching a single slicer setting.

Drying notes for PLA

At PLA drying temperatures spool deformation is rarely an issue — plastic spools stay well below their softening point. Do not exceed the recommended range, though: too much heat softens the wind itself and can fuse loops together.

If dried PLA turns brittle and snaps in the Bowden tube afterwards, that is physical aging, not moisture — drying cannot fix it. Test a meter by hand before committing a long print. When the cycle finishes, print immediately or move the spool into a sealed dry box with desiccant — and if you are unsure how much is left on the spool afterwards, the spool remaining calculator turns a scale reading into grams, meters and percent.

Step by step

1. Confirm it is wet — a rough, fuzzy surface where the same profile used to print glossy and clean, or popping and stringing after storage. When in doubt, dry anyway; it does no harm.
2. Check the spool rating before applying heat.
3. Set the dryer to 40–50 °C and run the full 4–6 h.
4. Print immediately or store dry — sealed box or bag with fresh desiccant.