The Perfect Bed Temperature for PETG 3D Printing

PETG is one of the best all-around filaments for functional prints — stronger than PLA, easier than ABS, and food-safe when printed right. But PETG has one notorious quirk: bed adhesion is a tightrope walk.

Too cold, and your first layer curls off the bed mid-print. Too hot, and PETG literally fuses to the build plate so aggressively that you damage the surface trying to remove the part. I've been through dozens of rolls across multiple printer builds. Here are the exact temperatures that work.

The Short Answer

For most PETG brands on most surfaces: 80°C bed temperature, first layer at 85°C. That's the starting point. But "most" isn't all — and the surface type matters more than the filament brand.

Temperature by Build Surface

Here are tested, proven bed temperatures for PETG across the most common build surfaces:

• Smooth PEI (spring steel): 80-85°C. This combo works great but PETG loves smooth PEI too much. Always use a release agent — a thin layer of glue stick acts as a separator. Without it, you will rip chunks of PEI off your sheet when removing prints. I learned this the hard way with a $25 sheet.
• Textured PEI: 80-85°C. The best surface for PETG, period. The texture provides mechanical grip for adhesion while preventing the chemical bonding that destroys smooth PEI. No glue stick needed. Parts pop off when the bed cools to 40°C.
• Glass (bare): 85-90°C. PETG on bare glass needs the extra heat. Adhesion is moderate — hairspray or glue stick recommended. Clean the glass with IPA between prints.
• Glass with PEI film: 80°C. Treat it like smooth PEI. Use glue stick as a release agent.
• Magnetic flex plate (non-PEI): 75-80°C. These surfaces typically have lower thermal conductivity, so the surface temp is a few degrees below the thermistor reading. Start at 80°C and reduce if adhesion is too aggressive.

First Layer Settings That Actually Matter

Bed temperature alone doesn't guarantee adhesion. Your first-layer settings make a huge difference:

• First layer height: 0.25-0.30 mm (even if the rest of your print is 0.2 mm). A thicker first layer gives more squish and surface contact.
• First layer speed: 20-25 mm/s. Slow is your friend. PETG needs time to bond. My standard is 20 mm/s for the first layer, 60-80 mm/s for the rest.
• First layer flow: 95-100%. PETG is more viscous than PLA, and overextrusion on the first layer causes elephant's foot. Start at 95% and bump to 100% only if you see gaps.
• First layer temperature: 5°C above your normal print temp. If you print at 235°C, do the first layer at 240°C for better flow and bonding.
• Fan on first layer: OFF. Zero fan speed for the first 2-3 layers. PETG contracts more than PLA when it cools — fan on the first layer is a recipe for corner lifting.

Troubleshooting PETG Bed Adhesion

Problem: First layer won't stick at all.

Increase bed temp by 5°C. Slow first layer to 15 mm/s. Make sure the bed is clean — wipe with 90%+ IPA. If it still won't stick, relevel the bed. PETG is less forgiving than PLA on Z-offset; you need the nozzle slightly closer.

Problem: Parts stick too well, damaging the surface.

Drop bed temp by 5°C. Apply glue stick as a release agent (yes, glue stick helps parts release — it creates a sacrificial layer between PETG and PEI). Let the bed cool completely to room temperature before removing parts.

Problem: Corners lift mid-print.

This is usually a drafty room or fan blowing on the first few layers. Turn off part cooling for layers 1-4. Add a brim (5-8 mm) for flat parts with large footprints. Close any enclosure doors if you have them.

Brand-Specific Notes

While 80°C works for most brands, a few run a bit different:

• Prusament PETG: 85°C on textured PEI. Prusa's own profile uses this, and it's spot on.
• Overture PETG: 80°C works perfectly. One of the most consistent budget brands.
• Hatchbox PETG: 75-80°C. Hatchbox PETG tends to be slightly stickier than average; lower temp helps.
• eSUN PETG: 80°C. Standard settings, no surprises. Reliable.
• Polymaker PolyLite PETG: 80°C. Excellent layer adhesion, smooth finish, works with default settings.

The bottom line? Start at 80°C on textured PEI, tune from there. PETG rewards patience on the first layer — get that right, and the rest of the print takes care of itself.