---
title: How to Fix Stringing in 3D Printing: Causes and Settings – rb3dlabs.com
url: https://rb3dlabs.com/fix-stringing-3d-printing/
site: RB3DLabs
---

# How to Fix Stringing in 3D Printing: Causes and Settings

**Stringing** (also called oozing or whiskers) is thin plastic strands left between separate islands of a print when the nozzle travels through open air. It wastes cleanup time and can spoil fine details — but you can usually tame it by changing *one* setting at a time.

Starting points, not rules

Retraction distance, speed, and nozzle temperature below are starting ranges. Printer, hotend, Bowden vs direct drive, and filament brand all change the answer. Never treat a forum number as universal.

## What stringing looks like

Fine hairs between towers, posts, or lettering; sticky webs inside hollows; small blobs where travel starts or ends. Heavy bridging sag is a related but different problem — fix bridging after the nozzle stops leaving travel whiskers.

## How to identify it

- Print a small dual-tower or stringing test (two pillars with travel between them)

- Photograph against a dark background so thin strands show

- Note whether strands are sparse whiskers or thick ropes (temperature/moisture often thicken them)

- Confirm the first layer is solid first — a bad first layer wastes calibration prints ([first-layer calibration guide](https://rb3dlabs.com/3d-printer-first-layer-calibration/))

## Common causes

- **Nozzle too hot** — filament stays runny and drips on travel

- **Retraction too short or too slow** — melt stays in the tip

- **Wet filament** — steam and soft melt increase ooze (PETG, nylon, and some PLA blends are sensitive)

- **Travel behaviour** — long travels across gaps, low travel speed, or missing “avoid crossing perimeters” style options

- **Material** — PETG and flexible filaments string more readily than stiff dry PLA

## Troubleshoot simple → advanced

Change **one variable per test print**. Re-slice, print the same tower, compare photos. If you change temperature and retraction together, you will not know which helped.

- **Dry or swap filament** — if the spool has been open in humid air, dry per the brand’s guidance or try a fresh dry roll before deep slicer tuning

- **Lower nozzle temperature slightly** — e.g. 5 °C steps within the manufacturer range (see the [filament temperature guide](https://rb3dlabs.com/3d-printing-filament-temperature-guide/) when available)

- **Enable / tune retraction** — small increases in distance, then speed; stay inside what your extruder can handle without grinding

- **Travel and combing** — prefer travels that stay inside walls when your slicer offers it; raise travel speed modestly if the machine is stable

- **Wipe / coast / extra restart distance** — only after temperature and retraction are in a sane band; these are fine-tuning, not first levers

- **Hardware checks** — PTFE gap (Bowden), worn nozzle, loose extruder grip — after slicer basics fail

## Retraction calibration

Direct-drive setups often need **shorter** retraction than Bowden (illustrative starting bands many people explore: roughly 0.4–1.2 mm direct drive vs a few millimetres on Bowden — verify on *your* printer). Increase distance in small steps until whiskers drop, then stop before under-extrusion or clicks appear. Then nudge retraction **speed** upward carefully; too fast can grind filament or skip.

If retraction is already high and stringing remains, temperature or moisture is usually the real culprit — do not keep stacking millimetres.

## Temperature testing

Run a temperature tower or reprint the stringing test 5 °C cooler (still inside the spool’s printed range). Cooler often reduces stringing; too cool hurts layer bonding and bridging. Prefer brand TDS ranges over random “PLA is always 200 °C” advice — details live in the [temperature guide](https://rb3dlabs.com/3d-printing-filament-temperature-guide/).

## Filament drying and storage

Store spools sealed with desiccant. Dry wet filament in a dryer or low oven only if the manufacturer allows that temperature. Wet PETG can string badly even with “perfect” retraction — drying is not optional troubleshooting theatre.

## Material-specific notes

- **PLA** — often improves with modest temp drop + light retraction; watch cooling

- **PETG** — strings easily; dry first, then temp, then retraction; may need slower travels

- **ABS / ASA** — enclosure and stable temps matter; stringing still follows the same order of operations

- **TPU** — soft filament buckles if retraction is aggressive; favour lower temp, slower travels, and gentle or disabled retraction per your extruder’s guidance

## Related tools

Confirm the model is not oversized before you burn filament on tests: [STL Viewer & Analyzer](https://rb3dlabs.com/tools/stl-viewer/). Keep the bed dialled with the [first-layer calibration guide](https://rb3dlabs.com/3d-printer-first-layer-calibration/) so every stringing tower actually sticks. Corners lifting instead of whiskers? See [warping troubleshooting](https://rb3dlabs.com/3d-print-warping/).