How to Stop PETG Stringing — Settings That Actually Work in 2026

Quick answer

PETG strings because it is sticky by nature and stays viscous at lower temperatures. Fix it by lowering the nozzle temp by 5-10°C from the spool recommendation, increasing retraction distance to 5-7mm (or 0.5-1mm for direct drive), increasing retraction speed to 40-50 mm/s, enabling combing inside, and ensuring your filament is dry. Temperature is the biggest lever — find your material's minimum working temperature and print there.

PETG is the most popular "upgrade from PLA" filament, and the most common complaint about it is stringing. If you have switched from PLA to PETG and your prints suddenly look like a spider sat on them, this is the fix.

Full disclosure: we have not printed with PETG yet on our X1C. This guide is compiled from manufacturer recommendations, slicer defaults, and testing data from the Bambu community. We flag this clearly — the filament guide covers what we have and have not tested.

If you need help choosing your filament, read our Bambu filament guide. And once PETG is dialed in, our maintenance tools guide covers keeping it running smoothly.

Why PETG Strings (The Short Version)

PETG is polyethylene terephthalate glycol-modified — a fancy name for "recycling-grade plastic that someone made printable." The properties that make PETG great (strength, flexibility, chemical resistance) also make it a stringing nightmare:

• High viscosity at lower temps. Unlike PLA, PETG does not "snap" cleanly when the extruder reverses. It stretches.
• Wide optimal temperature range. PLA has a narrow sweet spot. PETG works from roughly 220-260°C, and the stringing behavior changes dramatically across that range.
• Moisture sensitivity. Wet PETG strings worse. Significantly worse. If you have not dried your filament, stop reading and go do that first.

The Fix: Temperature First, Everything Else Second

The most effective single change is lowering your nozzle temperature. PETG stringing decreases dramatically as you approach the lower end of the printable range.

How to find your minimum working temperature:

1. Start at the spool's recommended temperature (usually 240-250°C).
2. Print a temperature tower (or a single calibration cube) and reduce by 5°C per section going down.
3. Find the lowest temperature where layer adhesion looks solid and extrusion is consistent.
4. Set your default to that temperature. Not a degree higher.

For most PETG brands on the X1C, this lands around 225-235°C. That is lower than what the spool says, but your prints will look significantly better.

Retraction Settings That Work

Bambu printers use a geared extruder design (indirect drive through PTFE tube), which means retraction works differently than on direct-drive printers. The filament has to travel through the PTFE tube before reaching the hotend, so you need more distance and more speed.

Recommended PETG retraction for Bambu printers:

Why "Combing Inside" matters: this setting forces the print head to retract through already-printed areas instead of through open air. The filament is "contained" during retraction, so any oozing happens inside the part rather than into empty space. It increases travel time slightly but reduces visible strings dramatically.

Dry Your Filament. Seriously.

Moisture in PETG turns to steam inside the hotend, creating tiny gas bubbles in the extruded filament. This causes stringing, pitting, cracking sounds, and poor layer adhesion. If your PETG has been out of the bag for more than a week in moderate humidity, it is probably wet.

Drying guide for PETG:

• Temperature: 65-70°C (use the X1C's built-in drying box or an external dryer)
• Duration: 4-6 hours for spools that have been open less than a month, 8-12 hours for spools that have been sitting
• Storage after drying: Seal immediately with desiccant packs in a dry box or sealed container

If you do not have a dedicated filament dryer yet, our accessories guide covers the best options.

Flow Rate — The Hidden Lever

PETG is often slightly over-extruded by default profiles, and extra material means extra stringing. Reducing flow rate by 2-5% can tighten up the extrusion enough to reduce the amount of "ooze" that forms strings during travel.

How to adjust in Bambu Studio:

1. Open the PETG profile.
2. Navigate to Extrusion → Flow.
3. Reduce Flow Rate from 100% to 96-98%.
4. Test with a calibration cube. Look for consistent wall thickness and reduced stringing.

Go too low (below 95%) and you will notice gaps and under-extrusion. Find the sweet spot through testing.

Travel Speed — Go Faster Between Extrusions

Slower travel speeds give PETG more time to ooze during non-printing moves. Increasing travel speed from the default 300 mm/s to 400-500 mm/s reduces the window for stringing during travel moves. The X1C and P1S handle these speeds without issue.

Cooldown Tower Test

If you are still struggling, print a cooldown tower. This is a calibration print that reduces fan speed incrementally across its height. It reveals how your PETG responds to cooling at different temperatures. PETG benefits from moderate cooling (25-35% fan speed) — too much cooling causes layer delamination, too little causes excessive stringing.

Recommended PETG cooling profile:

• Layers 1-3: 100% fan (first layer needs maximum cooling for adhesion)
• Layers 4-10: 35% fan
• Layers 11+: 25% fan

Print Speed — Slow Down for Clean PETG

The X1C wants to print at 500 mm/s. For PETG, that is too fast. The polymer does not have enough time to bond properly at those speeds, and the rapid acceleration/deceleration causes pressure spikes in the nozzle that manifest as stringing.

Recommended PETG speeds for Bambu printers:

• Perimeter speed: 150-200 mm/s
• Infill speed: 200-250 mm/s
• Outer perimeter speed: 80-120 mm/s (this is the visible surface — slow it down)
• Travel speed: 400-500 mm/s

Yes, this means PETG prints take longer than PLA. That is the tradeoff for better material properties.

Common Mistakes to Avoid

• Using PLA retraction settings for PETG. They are not interchangeable. PETG needs more retraction distance.
• Printing wet filament. This is the #1 cause of "PETG stringing" complaints. Dry first, then tune.
• Running the default profile without testing. Every brand of PETG is slightly different. The spool recommendation is a starting point, not gospel.
• Ignoring the enclosure fan. If you are printing PETG on the X1C with the enclosure, the fan door should be partially open for ventilation, but not so much that temperature drops cause warping.

Recommended PETG Brands for Bambu Printers

Not all PETG is equal. These brands consistently show up in positive reviews for Bambu printer owners:

• Overture PETG. Widely available, good dimensional accuracy, moderate stringing with proper settings.
• Polymaker PETG. Higher price, tighter tolerances, lower stringing tendency out of the box.
• eSUN PETG. Good value, consistent diameter, requires slightly lower temps than the spool says.
• Bambu PETG. Pre-calibrated profiles built into Bambu Studio, but more expensive per kilogram.

Troubleshooting Checklist

If you are still seeing strings after tuning, work through this list in order:

1. Is the filament dry? Dry it for 6 hours at 65°C and try again.
2. Is the temperature too high? Lower by 5°C and test.
3. Is retraction set correctly? 6-7mm distance, 45-55 mm/s speed, combing inside.
4. Is flow rate too high? Reduce to 96-98%.
5. Is travel speed too slow? Increase to 400+ mm/s.
6. Is the nozzle clogged or worn? Try a fresh nozzle. Partial clogs cause inconsistent flow.
7. Is the print speed too high? Slow perimeters to 150-200 mm/s.

95% of PETG stringing is resolved by the first three steps.

Bottom Line

PETG stringing is not a defect — it is the material's nature. But it is highly controllable with the right settings. Lower the temperature, increase the retraction, dry the filament, and slow the perimeters. In that order.

If you are choosing your first PETG spool, read our filament guide for brand recommendations. And make sure you have a filament dryer in your toolkit — it is the single biggest quality-of-life upgrade for PETG printing.

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