How to dry ASA filament

Dry ASA at 65–80 °C for 2–4 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. ASA is moderate — ASA behaves much like ABS around moisture, so expect moisture trouble after about a week of open storage in a humid room.

Wet ASA symptoms

The symptom ASA shows most characteristically is a matte, slightly gritty surface finish with steam-bubble craters. 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 ASA

This range is above the softening point of many plastic spools — some are rated only to roughly 70 °C. Transfer the filament to a metal or glass tray, or dry cooler for longer, or the wind can jam and loops can weld together.

ASA shares its drying row with ABS — the same settings apply, and the same spool-temperature caution does too. 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 matte, slightly gritty surface finish with steam-bubble craters, 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 65–80 °C and run the full 2–4 h.
4. Print immediately or store dry — sealed box or bag with fresh desiccant.