CoreXY: how the head of a fast printer moves
CoreXY is a way of moving a 3D printer in which two fixed motors move the print head on the X and Y axes through crossed belts, while the bed moves only up and down. It is fast and stable.
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How CoreXY works
CoreXY uses two stepper motors mounted firmly on the frame. Each one pulls a toothed belt, and the belts are routed so that they cross. If both motors turn the same way, the head goes in one direction, and if they turn opposite ways, it goes in the other. Diagonal moves come from a combination.
What matters is that the motors are carried by the frame, not the head. The head is therefore light and can accelerate and brake quickly. The bed moves only on the Z axis, which is an advantage on tall parts: the model does not wobble as it does on printers with a moving bed.
Pros and cons
- Speed. A light head tolerates high accelerations, so printing is faster (print speed).
- Stability. The bed does not move sideways, so a tall model is not at risk of tipping over.
- A natural shape for an enclosure. A fixed frame is easy to close in (enclosure).
- Drawback. The belts have to be equally tight, or the print comes out skewed and waves appear on the surface (ghosting). The design is more complex than simpler types.
What this means for your order
Our Elegoo Centauri Carbon 2 printers are CoreXY and enclosed, so they can print fast and still cleanly. That saves you time on the lead time, which is based on the real capacity of the machines (lead time).
Higher speed cannot be forced on everything, though. With fine detail or large overhangs the printer slows down, because quality matters more. Vibration at fast movement is also suppressed in software (input shaping). There is more on what can and cannot be done on a part under FDM.
Other layouts
The oldest type is Cartesian motion, where the bed moves forwards and backwards under the head and the head goes up and to the right. It is simple, but the moving mass is large, so at high speeds the whole machine shakes. Another type is the delta with three arms, which is fast but harder to calibrate.
CoreXY keeps the simplicity of a frame with a bed fixed in its plane and a light head. That is why most modern enclosed printers use it.
Common questions
What does CoreXY mean?
A type of kinematics where two fixed motors move the head on the X and Y axes via crossed belts. The bed moves only on the Z axis.
Is CoreXY more accurate than other printers?
Not automatically, but thanks to the light head it tolerates higher speeds without much vibration. Accuracy depends on the quality of the belts and the setup.
Which printers do you use?
Elegoo Centauri Carbon 2, CoreXY, enclosed, with an automatic filament changer for up to 4 colours.
Related terms
Stepper motor
A stepper motor is an electric motor that turns in small precise steps, which lets a 3D printer control head movement and filament feed without a position sensor. It normally has 200 steps per revolution.
Enclosure
An enclosure is a cover around the build area of a 3D printer that keeps the temperature steady and protects the print from draughts. It matters for materials that shrink a lot as they cool, such as ABS and ASA.
Input shaping
Input shaping adjusts a printer's motion commands so that frame vibrations cancel each other out, which gives cleaner edges even at higher speeds.
Print speed
Print speed is the speed at which the nozzle moves while laying plastic, given in mm/s. Higher speed shortens the print, but it is limited by surface quality and by how much plastic the nozzle can melt.
Filament changer
A filament changer is a device that automatically swaps filament spools during a print. It lets a single part be printed in several colours with no one stepping in.
Ghosting (ringing)
Ghosting is a 3D printing flaw where faint ripples, like an echo of the shape, appear behind sharp edges and corners, caused by printer vibration after a sudden change of direction.
SourcesSources checked 1 November 2026, 2
- CoreXY, Wikipedia, checked 2026-11-01
- Toothed belt, Wikipedia, checked 2026-11-01
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No model? No problem, pick a ready one
These sites have thousands of free models. Download an STL or 3MF and upload it here. If you sell it or use it for business, check the model licence. How to pick a model and licence