Ringing and ghosting

Wavy echoes that fade out after each corner. The print head changed direction, the whole machine rang like a bell, and the nozzle wrote that vibration into the surface. Everything that reduces it either lowers the excitation or stiffens the machine.

Looks like: Ripples or echoes on the surface just after a corner or a sharp feature.

Fixes, in the order worth trying

1 · Try this first

Lower acceleration and jerk

The abruptness of the direction change is what excites the vibration. This is the direct, immediate fix and it always works — the trade is print time.

Print Acceleration: Cura → Speed (enable Acceleration Control) → 1500–2500 mm/s² on a bed-slinger
Jerk / Junction deviation: Cura → Speed → Jerk 7–8 mm/s · Junction deviation 0.015–0.02
Outer wall acceleration: OrcaSlicer → Process → Speed → Acceleration → 1000–2000 mm/s² — only the visible wall needs to be slow

2 · Try this first

Tighten belts and check pulleys

A slack belt is a spring, and a spring oscillates. Tension both belts to a firm musical note and make sure every pulley grub screw is seated on the flat of its shaft.

Also check idler pulleys spin freely without wobble. A worn or over-tightened idler introduces its own periodic error that shows up as evenly spaced ripples.

3 · Common cause

Enable input shaping if your firmware supports it

Input shaping measures the machine's resonant frequency and pre-compensates the motion so the vibration cancels itself. It is the only fix that removes ringing without giving up speed. Available in Klipper, Marlin 2.1+, and built into most 2023-onward printers.

Klipper: run the resonance test with an accelerometer and apply the suggested shaper. Marlin: enable Fixed-Time Motion or use a ringing test tower to find the frequency manually. On Bambu and recent Prusa machines it runs automatically at the start of each print.

4 · Common cause

Stiffen or steady the printer

A flexing frame or a wobbly table amplifies everything. A bed-slinger on a springy IKEA shelf will ring no matter how well tuned the firmware is.

Put the printer on a solid, heavy surface — a paving slab or a concrete tile under it is a cheap and genuinely effective upgrade. Check frame bolts, especially where the gantry meets the uprights, and make sure the spool is not swinging on a rattly holder.

5 · Less common

Slow only the outer wall

Ringing is only visible on the exterior. Printing just the outer perimeter slowly while everything else stays fast gets most of the surface quality for a fraction of the time cost.

Outer Wall Speed: Cura → Speed → 25–40 mm/s
Outer wall speed: OrcaSlicer → Process → Speed → 25–50 mm/s

Change one thing at a time. If you adjust temperature, retraction and speed together and the problem goes away, you have learned nothing and you will be back here next month. Re-print the same test object after each single change.

Frequently asked questions

What is the difference between ringing and ghosting?

They are two words for the same artefact — the terms are used interchangeably. Some people reserve "ghosting" for faint echoes of a feature repeated further along the wall, and "ringing" for the ripple immediately after a corner, but the cause and the fixes are identical.

Why is ringing worse on the Y axis of my printer?

On a bed-slinger, the Y axis has to accelerate the entire bed and the print, which gets heavier as the print grows. The X axis only moves the toolhead. That mass difference is why Y ringing is usually worse, and why it gets worse as the print goes on.

Will a heavier print head make it worse?

Yes. Direct-drive extruders, multiple fans and added cameras all raise the moving mass, which lowers the resonant frequency and makes ringing more pronounced. It is a real trade-off against the benefits of direct drive, not a fault.