PETG on Prusa MK4

Nozzle Temp

225 °C

Range: 210 – 230 °C

Bed Temp

70 °C

Range: 50 – 70 °C

Print Speed

45

mm/s · max 60

Layer Height

0.20

mm · max 0.28

Fan Speed

50 %

1st layer: 0 %

1st Layer Speed

20

mm/s

Retraction

1.2 mm

@ 35 mm/s

Nozzle Type

Brass

Standard

  Retraction Note

• Prusa's built-in PETG profile is well-tuned. Use it as a base.

Settings

Recommended

Range

Nozzle Temperature

220 – 230 °C

210 – 230 °C

Bed Temperature

60 – 70 °C

50 – 70 °C

Print Speed

40 – 60 mm/s

up to 60 mm/s on this printer

First Layer Speed

20 mm/s

slower is better for adhesion

Layer Height

0.16 – 0.24 mm

0.12 – 0.28 mm

Fan Speed (Normal)

40 – 60 %

–

Fan Speed (1st Layer)

0 %

–

Retraction Distance

1.2 mm

Direct drive

Retraction Speed

35 mm/s

–

Nozzle Type

Brass (standard)

Brass is fine; hardened optional

Dry Filament

70 °C for ≥ 5 h

print from a dry box in humid weather

Enclosure

Not required

Not required — helps in a cold or draughty room

Support Material

PVA, PLA (interface)

–

Printing Notes

PETG Basic shares its print window with OzFDM PETG+. It is the value option for functional parts that do not need the extra toughness.

Dry it. PETG Basic picks up moisture as readily as any PETG, and a damp roll is the single most common cause of a bad PETG print.

The Nextruder's short filament path keeps retraction around 1 mm — a fraction of what a Bowden machine needs, and close to PrusaSlicer's stock value.

Input Shaper is enabled by default on the MK4, so the speeds above are achievable without the ringing you would get on an older machine.

Slicer: PrusaSlicer. Dry the filament at 70 °C / ≥ 5 h before a long print — every figure above assumes dry filament.

Troubleshooting

Stringing and popping sounds while printing — Moisture. Dry at 70 °C for at least five hours and store with desiccant afterwards.

Poor bed adhesion despite a hot bed — Clean the sheet with IPA. PETG is sensitive to finger oils in a way PLA is not.

Prints stick to the bed too well and damage the sheet — Drop the bed to 60 °C and raise Z offset slightly. PETG bonds aggressively to smooth PEI.