Wavy ripple patterns appear on flat vertical surfaces, especially after sharp corners. The waves are most visible on the wall that faces the direction of movement — after a sharp 90° corner, the wall perpendicular to that corner shows rippling. This is the printer frame oscillating after a fast direction change.
Confirm It’s Ghosting, Not Inconsistent Extrusion
Ghosting waves are regular and symmetric — they repeat at consistent intervals and decrease in amplitude as they move away from the corner. If the texture is irregular or random, it’s likely under-extrusion or a partial clog, not vibration.
Ghosting is worse at higher speeds. If the artifact disappears at 40mm/s but reappears at 80mm/s, it’s mechanical resonance.
Quick Test
Reduce print speed to 40mm/s and reprint. If the artifact shrinks or disappears, the issue is speed-related resonance — proceed with the fixes below. If the artifact looks the same at any speed, it’s a mechanical problem (loose components, worn bearings).
Fix Sequence
1. Tighten belts. Loose belts are the most common cause of ghosting on cartesian printers. The belt should feel firm under finger pressure with a consistent twang. Too loose and it vibrates freely; too tight and it stresses bearings prematurely. Check both ends of each belt — they often loosen unevenly. On CoreXY printers, both belts must be at equal tension or you’ll get diagonal artifacts.
2. Check for loose screws on the X-carriage and gantry. Any mechanical play amplifies resonance. Work through the motion system: X-carriage to rail, gantry to frame, print head to carriage. Tighten anything that moves when it shouldn’t.
3. Reduce acceleration. Lower acceleration means slower direction changes and less oscillation. Start at 1000mm/s² if you’re currently at 3000+. You’ll see longer print times but cleaner surfaces. Jerk/junction deviation also affects this: reduce jerk to 5–8mm/s or junction deviation to 0.01mm.
4. Enable input shaper (Klipper). Input shaper uses an accelerometer to measure the printer’s resonant frequency and applies a mathematical filter to cancel those oscillations. This is the most effective fix for ghosting on fast printers, especially CoreXY designs. Resonant frequencies typically fall between 25–60Hz for common printers.
5. Place the printer on a vibration-dampening surface. A heavy rubber mat, anti-vibration feet, or a mass-dampening platform reduces floor vibration coupling into the frame. This helps especially if the printer is on an unstable table or if you’re using a lightweight frame design.
What Doesn’t Help
Reducing flow rate or adjusting retraction — ghosting is mechanical, not an extrusion problem. Slowing only the outer perimeters without reducing acceleration won’t eliminate the resonance from the previous fast move still vibrating when the perimeter starts printing.