Ghosting, also called ringing, shows up as faint ripples that repeat after a sharp corner or a detail on the print. The wall echoes the feature for a few millimeters, then the surface goes smooth again. Per Prusa’s ghosting guide, the echo comes from the printer vibrating as the nozzle changes direction, and the fix is almost always less speed and tighter motion hardware.
The ripples are surface-deep, so the print is still strong. They only bother you on a part with flat walls and sharp details that need to look clean.
The material does not drive ghosting. It is a motion problem, not a filament one, so PLA, PETG, and the rest ghost the same way on a loose or fast machine.
Where the fault comes from
| Likely cause | Fix | Severity |
|---|---|---|
| Print speed or acceleration too high | Lower speed and acceleration, then reprint the same sharp-corner test. | hi |
| Loose belts or pulleys | Tension the belts to a firm pluck and tighten the pulley grub screws. | hi |
| Frame or components loose | Tighten the frame bolts and check the hot-end and fan shroud for play. | md |
| Resonance at a specific speed | Find the speed that rings worst and print just above or below it. | md |
| Heavy bed or carriage | Reduce moving mass where you can, since a lighter head vibrates less. | lo |
Start with these fixes
Print a small part with a sharp notch or hole, then work top to bottom and reprint after each step.
Slow the print
Drop print speed and acceleration and reprint. Most ghosting fades as the head moves calmer.
Tension the belts
Set each belt to a firm pluck, like a low guitar string, and retest.
Tighten the pulleys
Snug the grub screws on the pulleys so the belts cannot slip on the shaft.
Tighten the frame
Check frame bolts and the hot-end mount for play, and tighten what moves.
Deeper fixes when the quick ones fall short
When speed and tension do not end the echo, the resonance and the mass are the next place to look.
Find the ringing speed
Print a speed tower and note the layer that rings worst, then avoid that exact speed.
Reduce moving mass
Lighten the tool head or bed where the design allows, so the printer settles faster after a turn.
Add input shaping
On Klipper or firmware that supports it, run input shaping to cancel the resonant frequency.
How your filament matters
Ghosting is the same on PLA, PETG, ABS, and the rest, because the printer, not the filament, sets the echo. Wet filament does not cause ghosting, but a wet spool can add stringing on top of it. Keep the filament dry so you can read the surface clearly while you tune.
Habits that bring the echo back
A few common choices hide the cause or let the ripple return.
Avoiddo not
- Cranking speed back up as soon as the echo fades. The ringing returns at the old speed.
- Over-tensioning the belts. Too tight strains the motors and can cause layer shifts.
- Ignoring a loose hot-end or fan shroud, then blaming the slicer for the echo.
- Changing speed, belts, and acceleration in one pass, so the real cause stays hidden.
Key takeaways
- Ghosting is a ripple that echoes after a corner, caused by vibration, not filament.
- Lower speed and acceleration, then tension the belts and pulleys.
- Find and avoid the exact speed that rings worst.
- Change one thing and reprint the same sharp-corner test.
For the 3D-print-specific version, the ghosting on a 3D print page covers the same fault from a symptom-first angle. For related problems, the layer shift guide covers layers that print out of line, and the filament storage guide covers keeping spools dry.
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Sources & methodology
2 citations · reviewed 2026-07-10- 01Prusa Knowledge Base: Ghosting (waves after sharp edges)accessed 2026-07-09Tier 1
- 02All3DP: Ghosting and ringing causes and fixesaccessed 2026-07-09Tier 2