PETG Stringing Fix Guide
Fix PETG stringing with drying, temperature control, travel settings, retraction tuning, and realistic expectations for PETG surface behavior.
Dry the filament first
PETG absorbs moisture and wet PETG can string, pop, and leave rough surfaces. Drying often fixes what retraction alone cannot.
If the same profile suddenly strings worse, suspect filament condition before rebuilding the whole slicer profile.
Quick diagnosis path
Symptoms this guide helps with
- stringing
- fuzzy surfaces
- blobs
- wet filament
Likely causes
- Moist PETG
- Nozzle temperature too high
- Travel/retraction mismatch
- Too much open-air storage
Fast checks before changing settings
- Use Filament Advisor
- Dry/store before major tuning
- Lower temperature slightly
- Run a small retraction test
Safest first fix path
Temperature and retraction
Lower nozzle temperature in small steps if layer bonding remains acceptable. Increase retraction carefully; too much can cause jams or inconsistent extrusion.
Direct-drive printers usually need less retraction than Bowden printers.
Travel and cooling
Avoid unnecessary travel across open spaces when possible. Moderate fan can improve detail, but too much cooling can weaken PETG layer bonding.
PETG is often a little glossy and string-prone compared with PLA, so aim for controlled improvement instead of impossible perfection.
Quick checklist
- Filament dried
- Temperature lowered carefully
- Retraction tuned
- Travel moves reviewed
- Nozzle cleaned
- Small test repeated