FDM Print Speed Calculator

3D Printing Speed by Nozzle Diameter and Maximum Flow

What caps your print speed in FDM is the hotend’s maximum volumetric flow, measured in mm³/s. The working formula is v = flow ÷ (nozzle × layer_height). Plug in a 0.4 mm nozzle, a 0.2 mm layer, and 12 mm³/s of flow (about what a stock V6 manages) and you land near 150 mm/s. In day-to-day use, PLA runs at 50–100 mm/s, PETG drops to 40–50 mm/s so it doesn’t string, and ABS sits around 40–60 mm/s.

CoreXY machines such as the Voron 2.4 and the Ratrig V-Core 3 push 200–300 mm/s when paired with high-flow hotends like the Rapido, Dragon HF, or Revo HF, since there’s less mass to throw around. Add Klipper with input shaper and 250+ mm/s becomes realistic because the resonance gets canceled out; the Bambu Lab X1 Carbon, for its part, claims a theoretical 500 mm/s. Whatever your cruise speed, keep the first layer slow, around 20–30 mm/s, so it actually sticks.

Applications

Handy when you’re dialing in slicer profiles, weighing a 0.4 against a 0.6 or 0.8 mm nozzle for functional parts, or figuring out which hotend you need before buying an upgrade. It also catches the under-extrusion you’d hit by cranking speed without bumping the temperature and flow to match.

FAQ

Does setting 300 mm/s in the slicer guarantee 300 mm/s in practice? Not at all. On small parts the head barely gets up to speed before it has to slow down again, and max acceleration, jerk, and bed travel hold back the real figure.

Does a larger nozzle print faster? Generally yes. A 0.6 mm nozzle lets you push more volume through thicker layers, so total time drops, but you give up some resolution on the X/Y axes.

Is Klipper required for high speeds? No. Marlin 2.x supports input shaping as well. What Klipper gives you is easier calibration and more responsive remote control.