Max volumetric flowupdates live

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

Effective top speed

250mm/s

you asked for 300

target 300 → clamped

Pressure advance K

0.02

starting point — refine on-machine

Flow ratio

0.98

Bambu base (inherited)

Retraction length

0.8mm

Bambu base (inherited)

hotend ceiling 21 mm³/s · Bambu default — KingRoon publishes none ⚠ clamped — capped below your target speed

KingRoon · Rapid PLA High-speed product page

Nozzle215 °C

Density1.2 g/cm³

Drying55 °C / 8 h

Mfr speed30–600 mm/s

Mfr bed40–60 °C

Recommended nozzle 220 °C; tensile ≥60 MPa; elongation 19%; bending 80 MPa; flexural modulus 2680 MPa; Charpy 3.85 kJ/m²; melt index 8.2 g/10min @ 190 °C; HDT 53 °C; Rockwell 88; fan 100%

manufacturer source ↗

Is this right for your spool?

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

Against Bambu stock

flow 0.98 · ceiling 21 mm³/s

Source

product page · manufacturer ↗

Why these numbers

KingRoon Rapid PLA starts from Bambu's PLA Basic reference; KingRoon's published specs are overlaid where available, and everything else stays at Bambu's calibrated default.

Recommended nozzle 220 °C; tensile ≥60 MPa; elongation 19%; bending 80 MPa; flexural modulus 2680 MPa; Charpy 3.85 kJ/m²; melt index 8.2 g/10min @ 190 °C; HDT 53 °C; Rockwell 88; fan 100%

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 Rapid PLA 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.