How to Fix Stringing and Oozing

Stringing occurs when thin threads of filament are left between parts of your print. Learn how to eliminate stringing and oozing for cleaner prints.

Symptoms of Stringing and Oozing

  • Thin hair-like strings between printed parts
  • Blobs or bumps on the surface where the nozzle travels
  • Whisker-like filaments on overhangs and bridges
  • Excessive cleanup needed after printing

Common Causes

Temperature too high

When the nozzle temperature is too high, the filament becomes too fluid and continues to ooze during travel moves.

Retraction settings incorrect

Insufficient retraction distance or speed means filament isn't pulled back far enough to prevent oozing.

Wet filament

Moisture-absorbed filament creates steam bubbles that push melted plastic out during printing.

Travel speed too slow

Slow travel speeds give more time for filament to ooze from the nozzle.

Solutions

1Lower printing temperature

  1. Step 1: Reduce nozzle temperature by 5-10°C increments
  2. Step 2: Print a temperature tower to find the optimal setting
  3. Step 3: Stay within the manufacturer's recommended range

2Adjust retraction settings

  1. Step 1: Increase retraction distance (try 4-6mm for Bowden, 1-2mm for direct drive)
  2. Step 2: Increase retraction speed (30-50mm/s is typical)
  3. Step 3: Enable 'Retract on layer change' if available

3Dry your filament

  1. Step 1: Use a filament dryer at appropriate temperature for your material
  2. Step 2: Store filament in sealed containers with desiccant
  3. Step 3: Print from a dry box in humid environments

4Increase travel speed

  1. Step 1: Set travel speed to 150-200mm/s or higher
  2. Step 2: Enable 'Combing' or 'Avoid crossing perimeters' to reduce visible strings

Prevention Tips

  • Always store filament properly with desiccant
  • Run stringing tests when trying new filament
  • Use quality filament with consistent diameter
  • Keep your nozzle clean and free of debris

Frequently Asked Questions

Why does PETG string more than PLA?
PETG is more hygroscopic (absorbs moisture faster) and has a wider melting temperature range. It also tends to be 'stickier' when molten. Drying PETG and using slightly higher retraction settings typically helps.
Can I remove stringing after printing?
Yes, light stringing can be removed with a heat gun (briefly), a lighter (quick pass), or simply by hand. For delicate parts, tweezers work well. However, prevention is better than post-processing.
Does filament brand affect stringing?
Yes, higher quality filaments with tighter tolerances and better moisture control typically string less. Budget filaments may require more tuning.

Other Troubleshooting Guides

Warping and Lifting

Warping happens when corners or edges of your print lift off the bed during printing. Learn how to prevent warping for successful prints.

Poor Layer Adhesion

Layer adhesion issues cause weak prints that delaminate or break easily. Learn how to improve layer bonding for stronger parts.

First Layer and Bed Adhesion

Good first layer adhesion is crucial for successful prints. Learn how to achieve perfect bed adhesion every time.

Nozzle Clogs and Jams

Clogs prevent filament from extruding properly. Learn how to prevent, diagnose, and fix nozzle clogs.