Max volumetric flowupdates live

11.5 mm³/s The single value Bambu Studio can’t guess for you

Effective top speed

137mm/s

you asked for 300

target 300 → clamped

Pressure advance K

0.035

starting point — refine on-machine

Flow ratio

0.95

Bambu base (inherited)

Retraction length

0.8mm

Bambu base (inherited)

hotend ceiling 11.5 mm³/s · Bambu default — KingRoon publishes none ⚠ clamped — capped below your target speed

KingRoon · PETG-CF Carbon-fibre product page

Nozzle240 °C

Density1.25 g/cm³

DryingOven 50 °C / 8 h; AMS 2 Pro/HT 55 °C / 8 h; X1 bed 60–70 °C / 12 h

Mfr speednot published

Mfr bed70–90 °C

Hardened nozzle REQUIRED (explicit); tensile ≥36 MPa; elongation 0.10%; bending 72 MPa; flexural modulus 2950 MPa; IZOD impact 28 kJ/m² (5× std PETG); HDT 72 °C (highest in KingRoon range); melt index 19.6 g/10min @ 250 °C; length 330–340 m; fan 100%

manufacturer source ↗

Is this right for your spool?

Here's how sure we are — and what to watch.

Bambu ships no PETG-CF profile for the 0.4 mm nozzle

Tested sizes: 0.6, 0.8 mm. Using nearest defaults — verify with a calibration print.

Against Bambu stock

flow 0.95 · ceiling 11.5 mm³/s

Source

product page · manufacturer ↗

Why these numbers

KingRoon PETG-CF starts from Bambu's PETG-CF reference; KingRoon's published specs are overlaid where available, and everything else stays at Bambu's calibrated default.

Treat these as a starting point — run a flow-test cube and Bambu's Flow Dynamics calibration after import for the last few percent.

Open in the wizard → change printer, nozzle or speed

Download the KingRoon PETG-CF profile

A .zip with the Bambu Studio .json and a Markdown summary of every field.

Then calibrate in the slicer. Run Device → Calibration → Flow Dynamics after import to lock in the K-factor.