Stringing & Oozing Problems
Follow the steps. Most cases are fixed by step 1 or 2.
Lower temperature by 5 °C
Reduce the print temperature by 5 °C and run a test print, repeat up to twice (–10 °C total). A nozzle that's too hot allows filament to ooze even when extrusion is stopped.
Stay inside Bambu's nozzle range for the material:
| PLA | 190–240 °C |
| PETG | 240–270 °C |
| ABS | 240–280 °C |
| TPU | 200–250 °C |
Ranges: Bambu Lab filament material table, listed with a ±10 °C tolerance.
Increase retraction by 0.2 mm
Open the filament settings in Bambu Studio and increase the Retraction distance by 0.2 mm. The ideal range for Bambu Direct Drive is 0.4–1.0 mm.
More than 1.5 mm can cause gaps. Only change by 0.2 mm at a time and test in between.
Increase travel speed & avoid perimeters
Set travel speed to at least 200 mm/s: the faster the head moves, the less time filament has to drip. Also enable Avoid crossing wall in Bambu Studio (Process → Quality → Advanced).
Dry your filament
Wet filament causes stringing, look for crackling sounds or steam at the nozzle. Dry the filament before your next print.
| PLA | 50 °C · 8 hrs |
| PETG | 60–65 °C · 8 hrs |
| TPU | 70 °C · 8 hrs |
| Nylon | 75–85 °C · 8–12 hrs |
Less common causes
If steps 1–4 didn't help, expand the topic that matches your situation:
PETG strings more than PLA by design, some stringing is normal. Most effective: lower the temperature in 5 °C steps toward the low end of Bambu's PETG range (240–270 °C, material table), set retraction to 0.8 mm, enable Avoid crossing wall. High temperatures and long travel moves over gaps are the main causes.
1. TPU (worst) → 2. PETG → 3. Nylon → 4. ABS/ASA → 5. PLA (least). For TPU, Bambu's TPU guide recommends short travel moves (print one object at a time), fully dried filament and a nozzle about 5 °C cooler; if it still oozes, raise retraction in 0.2 mm steps from the profile value instead of maxing it out, because too much retraction can clog (Bambu's general advice: no more than 2 mm). Some stringing is generally unavoidable.
Thin strings can be removed with a heat gun from a distance or by pulling them off. Heavy stringing means your settings still need tuning, cleaning is not a substitute for fixing the root cause.
If small gaps appear after retractions, set Extra length on restart to 0.05–0.1 mm (Printer settings → Extruder → Retraction). This compensates for material lost during retraction and prevents under-extrusion after travel moves. Bambu Studio shows this option only after you enable Developer mode in Preferences, and Bambu calls it rarely needed: rule out wet filament and a partial clog first.
Still not working? Interactive troubleshooter · Community
Tools that fix this
Stop the wisps at the source and clean up what is left.
Moisture in the filament is the single biggest cause of stringing; drying it before printing removes most wisps.
Amazon →
Fine-tip tweezers pick off residual strings and pluck oozed wisps from the nozzle between prints without marring the part.
Amazon →Affiliate links. We may earn a small commission at no extra cost to you.
Nothing worked?
Ask in the official Bambu Lab forum or open a ticket via Bambu Lab support; photos help a lot. You can also contact us or post in our community forum. Or try the interactive troubleshooter.