Is "600mm/s" Real?
The number is real, but it's measuring the firmware/motion-system travel ceiling, not a sustained quality print speed. Realistic quality-checked speeds for clean outer walls on machines advertised at 500–600mm/s typically run 100–300mm/s, depending on part geometry, acceleration limits, and how much visible ringing you'll tolerate. Treat the headline speed the same way you'd treat a car's top-speed spec: technically achievable, not what you'll actually drive at daily.
Advertised speed vs realistic quality speed
| Advertised spec | Realistic quality-checked speed | Why the gap |
|---|---|---|
| "600mm/s" headline printer | 100–300mm/s | Achievable mainly on travel moves/simple geometry, not sustained outer walls |
| "250mm/s" mid-tier bedslinger | 80–150mm/s (outer walls) | Outer-wall quality speed is always lower than infill speed |
| CoreXY vs bedslinger, same firmware ceiling | CoreXY ~20–40% higher usable quality speed | Only the toolhead accelerates on CoreXY, not the bed's mass |
Full dataset: The 3D Printing Numbers.
What the advertised number actually measures
A printer's headline speed spec is typically the stepper motor and firmware's maximum commandable travel speed — how fast the toolhead or bed can physically move when nothing constrains it. It says nothing about whether the hotend can melt and extrude plastic fast enough to keep up (volumetric flow rate), whether the frame is rigid enough to avoid visible ringing at that speed, or whether the part's geometry allows sustained travel at that speed without constant deceleration through corners.
What actually caps real-world speed
- Volumetric flow rate — how much molten plastic the hotend can push per second at a given nozzle size and temperature; exceeding it causes under-extrusion regardless of how fast the toolhead moves.
- Acceleration and jerk settings — most G-code motion isn't in a straight line; corners force deceleration, and how aggressively the firmware allows re-acceleration affects both speed and ringing.
- Frame rigidity — a flexing frame at speed shows up as visible ringing/ghosting on the print's surface, which is often the real limiting factor before the motor's ceiling is reached.
- Kinematics class — CoreXY machines generally sustain higher usable quality speed than bedslingers at the same nominal spec. See Bedslinger vs CoreXY.
How to read a speed spec before buying
Look for a printer's benchmarked or "recommended" print speed in reviews and community testing, not just the headline motion-system number. If two printers list similar top speeds but one is CoreXY and the other a bedslinger, expect the CoreXY machine to hold quality noticeably better at any given speed setting.
Frequently Asked Questions
Not fake — it's a real measurement of the motion system's travel-speed ceiling, achievable on non-printing travel moves or very simple geometry. It's misleading only when treated as a sustained quality print speed for typical parts, which it isn't.
Print quality depends on acceleration and jerk limits, part geometry (corners force deceleration), material flow-rate limits at the nozzle, and how much visible ringing/ghosting you're willing to accept — all of which cap sustained speed well below the motion system's raw ceiling.
At the same nominal firmware speed, yes, typically — because only the lightweight toolhead accelerates on a CoreXY machine, not the bed and its printed part, which reduces the ringing/wobble that limits usable speed on a bedslinger.
For fine-detail prints, nozzle diameter and flow rate (a 0.4mm nozzle can only push so much molten plastic per second); for tall or geometrically complex prints, frame rigidity and acceleration/jerk tuning; for outer walls specifically, the visible-quality tolerance you're willing to accept.