How to Print PETG on Bambu Lab Printers: Complete Settings and Troubleshooting Guide

PETG is the most common upgrade from PLA — stronger, more heat-resistant, and often cited as food-safe. While raw PETG resin is FDA food-contact approved, FDM-printed parts have layer lines that harbor bacteria — so printed PETG isn’t truly food-safe for repeated use without a food-safe epoxy coating. But it’s also where most Bambu Lab users run into their first real problems. Stringing, poor bed adhesion, cloudy surfaces, and failed prints are incredibly common with PETG, and Bambu’s stock profiles don’t always get it right.

We run PETG across six Bambu Lab printers daily (X1C, X1E, P1S, P2S, A1, A1 Mini), and we’ve gone through the painful process of dialing it in. This guide shares everything we’ve learned.

Why PETG Is Different From PLA

Before diving into settings, you need to understand why PETG behaves so differently:

PETG is hygroscopic — it absorbs moisture from the air within hours. Wet PETG produces bubbling, stringing, and weak layers. This is the #1 reason for failed PETG prints.
PETG is stickier — it bonds to the nozzle more aggressively, causing oozing and stringing that PLA doesn’t have.
PETG shrinks differently — less than ABS but more than PLA, which means different cooling and bed adhesion strategies.
PETG doesn’t like being squished — too-close first layers stick permanently to the build plate and can damage PEI surfaces.

If you take away one thing from this guide: dry your PETG before printing. Everything else is secondary.

Recommended PETG Brands for Bambu Lab Printers

Not all PETG is equal. After running dozens of brands through our fleet, here’s what we recommend:

Best Overall: Overture PETG

Overture PETG is our go-to for production runs. Consistent diameter tolerance (±0.03mm), minimal moisture out of the box, and it works well with Bambu’s stock profiles as a starting point. Around $18-20/kg.

Best Budget: eSUN PETG

eSUN PETG is a solid budget pick at $16-18/kg. Slightly more stringing than Overture, but close enough for most applications. Their quality control has been reliable across multiple batches.

Best Engineering: Polymaker PolyLite PETG

Polymaker’s PETG is premium — excellent layer adhesion, very low stringing when properly dried, and consistent color-to-color. Worth the extra cost for visible parts and functional prints.

Best Transparent: SUNLU PETG

SUNLU’s transparent PETG prints surprisingly clear when dialed in. If you want light pipes, display cases, or semi-transparent housings, this is the pick.

Brands to Avoid

No-name Amazon PETG under $15/kg — inconsistent diameter, often arrives wet, poor spool winding causes AMS jams
Bambu Lab’s own PETG — decent but overpriced for what you get. Third-party options at half the cost produce identical results

Optimal PETG Settings for Every Bambu Lab Printer

Universal PETG Settings (All Bambu Printers)

These settings work as a solid baseline across the entire Bambu Lab lineup:

Temperature:

Nozzle: 230-240°C (start at 235°C)
Bed: 70-80°C (start at 75°C)
If printing transparent PETG, go hotter: 240-245°C nozzle

Speed:

Outer wall: 40-60 mm/s
Inner wall: 80-120 mm/s
Infill: 120-200 mm/s
First layer: 20-30 mm/s

Cooling:

Part cooling fan: 30-60% (NOT 100% like PLA)
Too much cooling = poor layer adhesion and cloudiness
Too little cooling = stringing and sagging overhangs
Start at 40% and adjust

Retraction:

Distance: 0.8-1.2mm (for direct drive Bambu extruders)
Speed: 30-40 mm/s
If you’re getting stringing with these settings, the issue is moisture — not retraction

First Layer:

Z offset: +0.02 to +0.05mm compared to PLA (back off slightly)
First layer speed: 20 mm/s
First layer flow: 95-98% (PETG expands more than PLA)
Bed temp: 80°C for first layer, 75°C after

X1C / X1E Specific Tips

The X1C and X1E have enclosed build chambers, which helps PETG significantly:

Chamber temperature naturally reaches 35-40°C, reducing warping
Use the 0.4mm brass nozzle for best thermal conductivity with PETG — brass outperforms steel thermally for non-abrasive materials
AMS works well with PETG if filament is dry — set PTFE tube slack appropriately
The lidar system’s auto-calibration works well with PETG. Trust it for first layer height.
Run flow calibration specifically for each PETG brand — don’t assume the PLA calibration transfers

P1S / P2S Specific Tips

The P1S and P2S are enclosed but don’t have the X1C’s advanced calibration:

P2S users: If your auto-calibration keeps failing with PETG, switch to manual calibration. Our P2S Calibration Guide covers the full manual process step-by-step.
Reduce first layer speed to 15-20 mm/s for reliability
The P1S runs slightly cooler than the X1C — add 5°C to nozzle temperature
P2S eddy current sensor benefits from a freshly cleaned bed before every PETG print

A1 / A1 Mini Specific Tips

Open-frame printers need more attention with PETG:

No enclosure = more cooling = more stringing. Reduce part cooling to 20-30%
Use a draft shield in Bambu Studio for tall prints (>100mm)
The textured PEI plate on the A1 series works better with PETG than the smooth plate
A1 Mini’s smaller build volume actually helps — less distance for ooze travel
If running PETG on an A1 Mini production loop (like our 3-unit farm), reduce retraction to 0.6mm

The #1 PETG Problem: Moisture

This needs its own section because 90% of PETG problems trace back to wet filament.

How to Tell If Your PETG Is Wet

Popping or crackling sounds during printing
Bubbles visible in the extruded filament
Excessive stringing that doesn’t improve with retraction changes
Rough, matte surface instead of the slight gloss PETG should have
Weak layer adhesion — parts snap apart easily at layer lines
Steam wisps visible coming from the nozzle

How to Dry PETG

PETG needs to be dried at 65°C for 4-8 hours before printing.

Best dryer for Bambu Lab users: The SUNLU FilaDryer S2 Plus fits standard 1kg spools and reaches the temperatures PETG needs. We run three of them in our production setup. For larger operations, the SUNLU S4 handles two spools simultaneously and has a wider temperature range.

Can you use an oven? Yes, but kitchen ovens have terrible temperature accuracy at low settings. A dedicated filament dryer is a $40-60 investment that saves hundreds in failed prints.

Can you use the AMS as a dryer? No. The AMS desiccant box slows moisture absorption but doesn’t remove existing moisture. Always dry filament BEFORE loading it into the AMS.

Print-While-Drying Setup

For best results with PETG, print directly from the dryer:

Load spool in the SUNLU S2 Plus/S4
Set temperature to 55°C (printing temp, slightly lower than pre-dry)
Route the filament through the dryer’s side guide to your printer
Print as normal — filament stays dry throughout the entire print

This eliminates moisture re-absorption during long prints. If you’re printing PETG parts longer than 4 hours, this setup is almost mandatory in humid climates (we’re in Florida — trust us on this one).

Bed Adhesion for PETG

PETG has a love-hate relationship with PEI build plates.

The Problem

PETG bonds to smooth PEI so strongly that it can rip chunks off the build plate when you remove the print. This is not a user error — it’s a material property.

The Fix

Option 1: Use the textured PEI plate. PETG adheres well to textured PEI but releases cleanly. This is the best solution if you print PETG regularly.

Option 2: Apply a separation layer. Use a thin coat of:

Glue stick (Elmer’s purple school glue) — cheap, effective, easy to clean
Hair spray (Aqua Net) — very thin coat, works well
Magigoo PETG — premium option, specifically formulated

Option 3: Z offset. Increase your Z offset by +0.02 to +0.05mm compared to PLA. PETG doesn’t need (or want) to be squished into the plate. A slight gap actually improves adhesion while making removal easier.

Removing PETG Prints

Wait for the plate to cool completely — PETG contracts and pops off easier when cold
Flex the magnetic build plate — the textured plate releases PETG prints easily this way
NEVER use a scraper on a smooth PEI plate with stuck PETG — you’ll damage the coating

Eliminating PETG Stringing

Stringing is the most complained-about PETG issue. Here’s the systematic approach:

Step 1: Dry Your Filament

Seriously. Do this first. 80% of stringing problems vanish after drying.

Step 2: Temperature Tower

Print a temperature tower from 225°C to 245°C in 5°C increments:

In Bambu Studio: right-click your model → Add modifier → Height range modifier
Set each 10mm section to a different temperature
Pick the temperature with the least stringing AND acceptable layer adhesion

Step 3: Retraction Calibration

If stringing persists after drying and temperature optimization:

Print a retraction test (two towers with travel moves between them)
Test retraction distances from 0.4mm to 1.6mm in 0.2mm increments
For Bambu Lab’s direct-drive extruders, you rarely need more than 1.2mm

Step 4: Travel Speed and Combing

Increase travel speed to 200+ mm/s (less time for ooze during travel)
Enable “Avoid crossing perimeters” in Bambu Studio
Enable wipe on retraction: 2-3mm wipe distance

Step 5: Accept Minor Stringing

Here’s the truth: PETG will always string slightly more than PLA. Very fine hairs (< 0.1mm) are normal and can be removed with a heat gun set to low for 2-3 seconds. If you’re chasing absolute zero stringing with PETG, you’ll drive yourself insane.

AMS Compatibility With PETG

The Bambu Lab AMS works with PETG, but it requires more attention than PLA.

AMS Tips for PETG

Dry filament before loading — wet PETG causes more friction in the PTFE tubes
Check PTFE tube routing — PETG is stiffer than PLA and more prone to binding on tight bends
Set proper filament type — make sure Bambu Studio knows it’s PETG, not PLA. The firmware adjusts retraction behavior.
Watch for AMS feeding errors — if you get frequent “filament cutter error” or “filament tangle” alerts with PETG, the culprit is usually moisture-swollen filament or a cheap spool with uneven winding
Use quality spools — brands like Overture and eSUN wind consistently. Cheap brands with loose winding cause AMS jams.

For detailed AMS troubleshooting (all materials), see our AMS Troubleshooting Guide.

PETG Applications — What We Print With It

PETG sits in the sweet spot for most functional printing. It’s stronger and more heat-resistant than PLA, easier to print than ABS, and doesn’t require an enclosure (though one helps).

From our print farm, here’s what we use PETG for daily:

Drone components — motor mounts, camera plates, GPS housings. PETG handles vibration and minor impacts without cracking like PLA would.
Electronics enclosures — temperature stable enough for components that generate heat, and it doesn’t warp in a Florida garage in summer.
Production jigs and fixtures — our A1 Mini production loop uses PETG templates and guides. They last months of daily use.
Replacement household parts — dishwasher-safe (top rack) with proper settings, which PLA absolutely isn’t.

Troubleshooting Quick Reference

Problem: First layer won’t stick

Clean bed with IPA (90%+)
Increase bed temp to 80°C
Back off Z offset (less squish)
Apply glue stick to smooth PEI plate

Problem: Prints are cloudy/foggy

Reduce cooling fan to 20-30%
Increase nozzle temperature by 5°C
Dry your filament

Problem: Layer adhesion is weak

Dry your filament (this is almost always the cause)
Increase nozzle temperature by 5-10°C
Reduce cooling fan percentage
Slow down print speed

Problem: Surface is rough/bumpy

Filament is wet — dry it
Clean your nozzle (cold pull)
Check for partial clog

Problem: Stringing everywhere

Dry your filament (yes, again)
Run a temperature tower
Increase travel speed
Adjust retraction: 0.8-1.2mm at 35mm/s

Problem: PETG stuck to bed and won’t come off

Let plate cool completely
Flex magnetic plate
Use textured PEI next time
Apply glue stick as release agent

Bottom Line

PETG on Bambu Lab printers is entirely doable — it just needs more attention than PLA. The three keys are:

Always dry your filament — get a SUNLU S2 Plus or S4. This alone fixes most problems.
Back off the first layer — slight positive Z offset, reduced flow, don’t squish PETG.
Less cooling than PLA — 30-40% part cooling, not 100%.

Nail those three things and you’ll get reliable PETG prints across the entire Bambu Lab lineup. We print PETG daily on everything from the A1 Mini to the X1E, and it’s been our most-used material for functional parts.

Need help calibrating your P2S specifically? Our P2S Calibration Guide walks through every manual calibration step for all materials, including PETG-specific tuning.

Written by Austin Prysock — FDM Process Engineer at Slice Engineering, running 6 Bambu Lab printers in production. Questions? Find us on TikTok @adp.industries or visit adpindustries.com.