Drying is a material-specific process. Too little heat leaves moisture in the polymer; too much heat can soften, fuse or oxidise the spool. Use the manufacturer’s window, verify with weight loss and confirm with a print test.
Start with the polymer, not a generic chart
- PLA usually dries lower and faster than PA or PC
- TPU can absorb moisture but tolerates moderate heat
- PA, PC and PVA need longer, more careful drying
- Composite grades may need a gentler cycle
Control temperature, time and airflow
Spread the spool so air can move through the strands. Use a dryer with stable temperature control and a lid that allows moisture to escape. Turn the spool periodically if the dryer has uneven heat.
Verify instead of guessing
- Weigh before and after drying
- Record temperature and duration
- Print a small test with the same profile
- Seal the spool with desiccant after cooling
Avoid the common drying damage
Never dry above the material’s softening range. Do not dry a full spool at a temperature intended for loose pellets. Let the spool cool before vacuum sealing to prevent condensation.
| Material | Typical drying range | Typical time | Watch point |
|---|---|---|---|
| PLA | 40–50 °C | 4–6 h | Avoid softening |
| PETG | 55–65 °C | 4–6 h | Do not fuse strands |
| TPU | 45–55 °C | 4–8 h | Gentle airflow |
| PA / PC | 70–90 °C | 6–12 h | Check manufacturer limit |
| PVA | 40–50 °C | 4–8 h | Do not overheat |
Common engineering mistakes
- Using one temperature for every polymer.
- Drying a full spool at pellet temperature.
- Skipping the weight check.
- Sealing a hot spool.
- Leaving the spool in open air after drying.
Checklist
- Is the dryer temperature verified?
- Is the spool spaced for airflow?
- Was weight recorded before and after?
- Did the test print improve?
- Was the spool sealed with desiccant?
Ask for a drying and packaging recommendation for your material through the quote form.