If you’ve printed even one spool of PETG, you’ve met the spider webs: fine, fuzzy strands draped across your part, bridging every travel move. The good news is that a proper PETG stringing fix with the right OrcaSlicer settings is well within reach. The honest news is that PETG is inherently stringier than PLA — your goal is to reduce stringing to a quick post-processing pass, not to chase a mythical zero-strand print. This guide gives you the exact levers, sensible starting numbers, and the order to pull them in.

We’ll be blunt about trade-offs where they exist, because rule-only tutorials that promise “one setting fixes everything” set you up to fail. PETG rewards a systematic approach.

Why PETG Strings in the First Place

Before you touch a single OrcaSlicer slider, understand the four root causes. Get the diagnosis right and the fix is fast.

  • Moisture. PETG is hygroscopic — it pulls water out of the air. Wet filament bubbles and oozes in the melt zone, producing stringing that no amount of retraction tuning will fix. This is the single most overlooked cause.
  • Nozzle temperature too high. When the nozzle runs too hot, the melt becomes very fluid and leaks out during travel.
  • Insufficient retraction. If retraction distance or speed is too low, the nozzle doesn’t pull the melt back during travel moves, so plastic oozes out and draws strings.
  • Hardware issues. Nozzle wear or a partial clog makes stringing worse and masks your tuning. Rule it out before you blame settings.

Step 1: Diagnose and Dry the Filament (Do This First)

Skip this and you’ll waste an evening tuning retraction on a problem that’s actually water. The fastest diagnostic is to listen and watch during the first few minutes of a print. Popping, crackling or hissing from the nozzle is moisture flashing to steam — dry the spool immediately. Other tells: a rough surface texture and stringing that simply doesn’t respond to retraction changes.

To dry PETG properly:

  • Temperature: 60–65°C is the safe sweet spot. Never exceed 70°C. PETG’s glass transition temperature is around 80°C, and getting near it in a dryer makes adjacent wraps on the spool stick together, causing tangled feeding.
  • Time: 6–8 hours for normally damp filament. For a heavily saturated spool, extend to 8–12 hours. Bambu Lab’s own PETG Basic data sheet specifies 8 hours at 65°C, which is a solid default.
  • Don’t over-dry. Leaving PETG baking beyond 8–10 hours can make it brittle even at safe temperatures. More is not better.
  • Store it dry. Straight after drying, seal it in an airtight container with silica gel desiccant, or vacuum-bag it.

AMS users, note: an AMS slows re-absorption after drying, but it will not dry a wet spool. Dry your PETG before loading it, not after.

Step 2: Dial In Print Temperature in OrcaSlicer

PETG prints well between 230 and 250°C, with a 70–85°C bed. A sensible OrcaSlicer starting point is 240°C nozzle / 80°C bed, then adjust to your specific filament brand.

Here’s the trade-off to keep in mind: printing hotter improves layer adhesion and strength but increases stringing; printing cooler cuts stringing but can weaken layer bonding. Some makers deliberately run PETG at 250–260°C for strong functional parts and just accept a quick clean-up pass afterwards. Both camps are right for their use case.

If stringing is your priority, drop the nozzle temperature in 5°C increments and re-print a stringing test. Keep going until strings reduce without hurting adhesion or causing clogs. You’ll usually find a clean window of 10–15°C that gives you the best of both.

Step 3: Tune Retraction — The Core Lever

In OrcaSlicer, you’ll find these under Filament → Retraction → Retraction length (and the related speed/wipe options). Retraction settings depend heavily on your extruder type, so match the starting numbers to your hardware.

Direct drive extruders

Start at 0.8mm. The filament path is very short, so small retractions are enough. Going above roughly 3mm risks pulling softened filament up into the cold zone and clogging. PETG often wants a touch more than PLA, so creep up in 0.2mm steps if strings persist.

Bowden extruders

Start at 5.0mm, with a usable range of 4.0–7.0mm. The Bowden tube introduces slack and compression that need a longer pull to relieve nozzle pressure. A stock Creality Ender 3, for example, typically needs 5–6mm. Increase gradually rather than jumping straight to 7mm.

Retraction speed matters too — too slow and the melt keeps oozing during the pull. A reasonable PETG range is 25–40 mm/s; faster speeds risk grinding the filament with a soft material like PETG, so don’t max it out blindly.

Change one variable at a time and re-print the same test. If you swing distance, temperature and speed all at once, you’ll never know which one worked.

Step 4: Wipe, Travel and Cooling

Once temperature and retraction are close, these settings clean up the last of the strings:

  • Wipe while retracting: enabling a wipe move drags the nozzle to smear residual ooze rather than leaving a blob to string from. Effective on PETG.
  • Travel speed: faster non-print travel gives the melt less time to ooze across a gap. Bump it up if your machine’s motion system can handle it cleanly.
  • Cooling: PETG generally likes lower fan speeds than PLA for layer strength, but a little more cooling can help freeze oozed material before it strings. Tune fan in small steps and watch for warping or weak layers.

If you’d rather not iterate by hand, this is exactly the kind of problem our Diagnose tool is built for: upload a photo of the stringy print and it identifies the defect and returns concrete, slicer-specific recommendations — including downloadable .ini patches for PrusaSlicer and OrcaSlicer so you can apply the fix in one click. For a walkthrough of how that works, see how to diagnose a failed 3D print from a photo.

The Tuning Order, Summarised

  1. Dry the filament (65°C, 6–8 hours) and rule out a worn or clogged nozzle.
  2. Set 240°C / 80°C, then drop temperature in 5°C steps to cut ooze.
  3. Retraction: 0.8mm direct drive / 5.0mm Bowden, adjusting in small steps.
  4. Enable wipe, raise travel speed, fine-tune cooling.
  5. Re-test after each change with the same stringing model.

For more on catching problems before they waste filament, our G-code checker guide and the pre-flight checklist are worth a read. And if your stringy print turned into a full failure, these are the real culprits behind print failure.

FAQ

Can you completely eliminate PETG stringing?

Realistically, no — PETG is more prone to stringing than PLA by nature. The practical target is to reduce it to fine wisps you can clear with a quick heat-gun pass or by snapping them off. If you’re chasing a perfect zero-strand print, you’ll spend more time tuning than printing.

What temperature should I dry PETG at, and for how long?

Dry at 60–65°C for 6–8 hours, extending to 8–12 hours for a heavily saturated spool. Never exceed 70°C — you’ll risk softening the spool and tangling the wraps. Don’t over-dry past 8–10 hours either, as prolonged heat can make PETG brittle.

What retraction distance should I use for PETG in OrcaSlicer?

Start at 0.8mm for direct drive extruders and 5.0mm for Bowden setups, found under Filament → Retraction. Adjust in small increments — 0.2mm for direct drive, 0.5mm for Bowden — and re-print your stringing test after each change.

Why does my PETG still string after tuning retraction?

Almost always moisture. If retraction changes make no difference and you hear popping or hissing from the nozzle, the filament is wet. Dry it before doing anything else. A worn nozzle or partial clog can also produce stringing that no setting will fix.