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PETG-CF settings for the Anycubic Kobra 3

✓ Great match Advanced Engineering

These are hardware-tuned starting settings for printing PETG-CF on the Anycubic Kobra 3. The Anycubic Kobra 3 pairs a direct-drive extruder with an all-metal hotend on an open frame, and tops out at 300°C hotend / 110°C bed. Against PETG-CF's ideal range (240–260°C), that lands us at 250°C nozzle and 80°C bed. Carbon-fibre PETG combines PETG toughness with extra stiffness and demands a hardened nozzle.

Quick answer: 250°C nozzle · 80°C bed · 63 mm/s · 1.5 mm retraction · 40% part fan. Change one setting at a time and validate with a small calibration model.
250°
Hotend
80°
Bed
63
mm/s
40%
Part fan

Recommended PETG-CF profile

Hotend temperature250°C (tower 240–260°C)
Bed temperature80°C
Print speed63 mm/s
Retraction1.5 mm (direct drive)
Part cooling fan40%
Bed adhesionLike PETG; hardened nozzle required.
NozzleHardened steel (this filament is abrasive)
First layer speed22–32 mm/s; same bed temp, verify Z offset
Flow / extrusion multiplierStart at 100%; calibrate flow before touching retraction
DryingStrongly recommended — dry before printing if you hear popping or see inconsistent extrusion
💡 Best uses for PETG-CF: rigid functional parts, tooling. Estimate the material cost of your next PETG-CF print with the filament cost calculator.

How PETG-CF behaves

StrengthFlexibilityHeatEaseDurabilityDetail

PETG-CF property profile

Strength 82
Flexibility 15
Heat resistance 60
Ease of printing 55
Durability 70

Calibration order

  1. Dry the spool if it shows moisture symptoms, then confirm the nozzle and build plate are clean.
  2. Print a temperature tower inside the 240–260°C range; pick the lowest temperature with strong layer bonding and clean overhangs.
  3. Calibrate flow, then pressure/linear advance if your firmware supports it.
  4. Tune retraction last — more distance is not always better, especially on the direct-drive Anycubic Kobra 3.

PETG-CF brands & what to expect

CF-PETG keeps PETG’s toughness and moisture-sensitivity while adding stiffness and abrasion. Brands vary in fibre load, but all of them require a hardened nozzle and benefit from drying.

🔎 It combines two things that fight you — PETG’s stringing and carbon fibre’s abrasion — so dry the spool AND fit a hardened nozzle. When both are handled, it makes excellent rigid functional parts.

Popular PETG-CF brands: Polymaker, Bambu Lab.

Common PETG-CF problems on the Anycubic Kobra 3

SymptomLikely causeFix
StringingWet filamentDry first; then tune retraction as with plain PETG.
Under-extrusion over timeNozzle wear/clogHardened nozzle; slightly larger diameter.

On the Anycubic Kobra 3 specifically: fit a hardened nozzle before running much PETG-CF — the stock hotend still uses a brass nozzle that wears out fast on abrasive filament.

PETG-CF troubleshootingSymptoms, likely causes and a safe test orderCompare PETG-CF across printersMaterial ranges and every per-printer profile

FAQ

What temperature should I print PETG-CF on the Anycubic Kobra 3?
Start at 250°C for the hotend and 80°C for the bed, then run a temperature tower across 240–260°C to dial in your exact filament brand. Our temperature tower planner builds the tower for you.
What print speed works for PETG-CF on the Anycubic Kobra 3?
Around 63 mm/s is a safe starting point. This printer can go faster once the profile is tuned, but start conservative for clean walls. Check your real speed ceiling with the max volumetric flow calculator.
What retraction should I use for PETG-CF?
Use about 1.5 mm of retraction (direct drive needs very little). If you see stringing with PETG-CF, raise retraction speed before distance and dry the filament first.
Do I need an enclosure for PETG-CF on the Anycubic Kobra 3?
No, PETG-CF prints fine in the open on the Anycubic Kobra 3.
Do I need a hardened nozzle for PETG-CF?
Yes. PETG-CF is abrasive and will wear out a brass nozzle quickly — fit a hardened steel or ruby nozzle before printing much of it.

Reviewed 2026-08-18. See how these starting settings are calculated. Numbers are conservative starting points, not lab measurements.