PETG Print Settings: The Definitive Dial-In Guide for Perfect Prints

PETG sits in a sweet spot that no other filament occupies: nearly as easy to print as PLA, significantly stronger and more heat-resistant, and available at similar prices. Yet many makers struggle with it — stringing, poor bed adhesion, and blobbing are common complaints. This guide fixes all of that.

Understanding Why PETG Behaves Differently

PETG's challenges stem from its chemistry. It has a higher melt viscosity than PLA, meaning it flows differently and requires different retraction settings. It also bonds very aggressively to surfaces — great for layer adhesion, problematic if it bonds too well to your print bed.

Temperature Settings

**Hotend:** Start at 240°C for your first layer, then drop to 235°C for subsequent layers. Higher temperatures improve layer adhesion but increase stringing. If you see significant stringing, drop 5°C at a time until it improves.

**Bed:** 70–85°C is the target range. 75°C works well for most PETG on a PEI surface. Too hot and the first layer bonds so aggressively it can tear the PEI sheet on removal.

Retraction: The Key to Eliminating Stringing

Retraction is where most PETG problems originate. The settings differ significantly by extruder type:

• ▸**Direct drive:** 1–2mm retraction at 25–35mm/s
• ▸**Bowden:** 4–6mm retraction at 40–50mm/s

Start at the lower end and increase in 0.5mm increments if stringing persists. Excessive retraction causes grinding and jams — more is not always better.

Speed Settings

PETG does not like speed. Slow down compared to your PLA profiles:

• ▸**Print speed:** 40–60mm/s
• ▸**First layer:** 20–25mm/s
• ▸**Outer perimeters:** 30–40mm/s
• ▸**Infill:** 60–80mm/s

Bed Adhesion

PETG adheres extremely well to PEI surfaces — sometimes too well. To prevent bed damage:

1. Apply a thin layer of glue stick to the PEI surface as a release agent 2. Let the bed cool to 40°C before removing prints 3. Never force a print off a hot bed

Glass with hairspray also works well and provides easier release.

Cooling

PETG benefits from moderate cooling — less than PLA, more than ABS. Set your part cooling fan to 30–50% for most prints. Bridging and overhangs benefit from higher fan speeds (60–80%), but excessive cooling can cause layer delamination in structural parts.

Common Problems and Fixes

**Stringing:** Reduce temperature by 5°C, increase retraction by 0.5mm, enable "wipe on retract" in your slicer.

**Poor bed adhesion:** Increase first layer temperature to 245°C, slow first layer to 20mm/s, ensure bed is properly leveled.

**Blobbing at layer start:** Enable "extra restart distance" with a negative value (-0.2 to -0.5mm) to compensate for ooze.

**Layer delamination:** Increase temperature, reduce cooling fan speed, slow print speed.

Recommended PETG Brands

Polymaker PolyLite PETG and Hatchbox PETG consistently deliver the best results across a range of printers. Both maintain tight diameter tolerances and produce minimal stringing with properly dialed settings. Bambu's PETG HF (High Flow) is excellent for Bambu printer owners who want maximum speed.