PETG print settings

PETG prints at about 240 °C with a 80 °C bed and 40% part cooling. Usable range 225–255 °C nozzle, 70–90 °C bed. No enclosure needed.

PET-GCopolyesterGradient PETGRainbow PETGMulti-Colour PETG

Starting settings

Nozzle: 225–255 °C (start 240)
Bed: 70–90 °C (start 80)
Part fan: 20–60% (start 40%)
Wall speed: 25–45 mm/s
Max volumetric flow: 9 mm³/s
Shrinkage: 0.4%
Softens at: 80 °C
Enclosure: Helps
Nozzle size: 0.4 mm or larger — 0.4 mm recommended
Nozzle material: Brass is fine
Drying: 65 °C for 6 h

Speed

SLOWER than PLA — 25–45 mm/s. PETG needs contact time to fuse to the layer below. Run it at PLA speeds and you get parts that look fine and snap cleanly along the layer lines.

Bed surface

Textured PEI is ideal. On SMOOTH PEI, apply glue stick as a RELEASE agent — PETG chemically bonds to bare smooth PEI and will tear the sheet coating off with the part.

What bites people

Sticks too well, not too little. The failure mode is a destroyed build surface, not a part that comes loose.
Wants a slightly HIGHER first-layer Z-offset than PLA. Squishing PETG like PLA is what causes it to weld itself to the plate.
Stringing is wet filament roughly 80% of the time. Dry first, tune retraction second.
Do not over-cool. Heavy fan looks cleaner but destroys layer adhesion, which is the entire reason to choose PETG over PLA.

Safety

Nozzle above 230 °C. Bed above 70 °C is hot enough to burn.

Open First Layer →
The app walks this in order, generates the test model for your nozzle and filament, and records what you measure so nothing has to be repeated. Free, no account, works offline.