// filament drying guide
Technical Mastery. Creative Design. Made in Puerto Rico.
Drying temps, times, and storage for every common filament.
Filament Drying Guide
Is your filament wet?
- Popping, hissing, or steam at the nozzle
- Excessive stringing and oozing
- Filament snaps easily when bent
- Rough, matte, or fuzzy surface finish
- Weak layer adhesion and brittle parts
- Tiny bubbles or pits in extruded lines
Two or more of these — especially popping sounds — almost always mean moisture. Dry the spool before chasing slicer settings.
Drying temperatures & times
| Material | Dry temp | Time | Storage RH | Moisture uptake | Notes |
|---|
CF/GF-filled blends dry like their base polymer. Ranges are consensus starting points — always check your manufacturer's spec if listed.
Drying methods
Filament dryer
Purpose-built, holds accurate temps, and many let you print straight from the dryer. The best option if you print hygroscopic materials regularly.
Food dehydrator
Great airflow and stable low temps. Most spools need the trays removed and sometimes a taller ring. A favorite budget workhorse.
Oven
Works only if your oven is accurate and stable at low temperatures. Verify with a separate thermometer first — many home ovens swing ±15 °C, enough to ruin PLA or PETG.
Heated bed + box
Set the printer bed to the target temp, place the spool on it, and cover with a cardboard box to trap heat. Slow but free, and fine for PLA/PETG maintenance drying.
Keeping it dry
- Dry boxes: airtight container + desiccant + cheap hygrometer. Target under 20% RH for everyday materials, under 15% for nylon, PC, TPU and PVA.
- Desiccant: color-indicating silica gel tells you when it's saturated. Recharge it in the oven or your filament dryer instead of throwing it away.
- Vacuum bags with valves: good for archiving spools you won't touch for months; add a desiccant packet inside each bag.
- Print-from-box: for hygroscopic filaments in humid climates — like ours in Puerto Rico — feed the printer directly from a sealed dry box through a PTFE fitting.