Quick answer
Ghosting (also called ringing or echoing) is the faint, repeating ripple you see just after sharp corners and around embossed text. It is caused by vibration in the printer, not by your filament. Fix it by slowing print speed to 40-60 mm/s, lowering acceleration to roughly 500-1500 mm/s2, tightening your belts, and — on capable machines — running input shaping / vibration compensation.
Why ghosting and ringing happen
When the toolhead changes direction quickly, the frame, gantry and print head flex and keep oscillating for a fraction of a second after the move. The printer is still laying down plastic while it wobbles, so those vibrations get “printed” into the wall as a wavy echo of the corner or letter that triggered them. Anything that lets the machine vibrate more — high speed, aggressive acceleration, loose belts, a flexing frame, or a wobbly table — makes the ripples deeper and longer. The fixes below work from the most common cause to the least.
1. Slow down print speed
Speed is the fastest test. Drop your wall and outer-wall speed to 40-60 mm/s and reprint a small cube. If the ripples shrink dramatically, vibration is confirmed as the cause and you can decide how much speed you want to trade back for quality. Outer walls matter most because that is the surface you actually see.
2. Lower acceleration and jerk
Even at a modest speed, a high acceleration value snaps the head into motion hard enough to ring. Reduce acceleration to about 500-1500 mm/s2 and lower jerk (called “junction deviation” in some slicers) to roughly 5-10 mm/s. Sudden direction changes are what excite the frame, so taming how abruptly the head starts and stops often does more than raw speed.
3. Tighten your belts
A loose belt lets the toolhead lag and overshoot, which reads as ringing. Press a belt midway along its run with your thumb: it should feel taut like a guitar string, not spongy, with only slight deflection. Tighten using your printer’s belt tensioner, or reposition the motor/idler if it has no tensioner. Tighten evenly and avoid over-tensioning, which strains bearings and motors.
4. Check the frame, pulleys and screws
Confirm the drive pulleys on the stepper motors are not slipping — the grub screw should be seated on the flat of the motor shaft. Check that idler pulleys spin freely without wobble, and that frame bolts, gantry screws and wheel eccentric nuts are snug. On bed-slinger printers (Ender-style), a loose or tall Z gantry is a frequent hidden cause; bracing the top of the gantry to the frame noticeably reduces ringing.
5. Run input shaping / vibration compensation
Modern firmware can cancel vibration before it reaches the print. Klipper and recent Marlin call it “input shaping”; Bambu Lab calls it vibration compensation / resonance compensation. The printer moves the head in a test pattern, measures its resonant frequencies with an accelerometer, and builds a profile that counteracts them. On Bambu Lab machines (P1, X1, A1) run the vibration calibration from the screen or Bambu Studio; the X1C additionally validates the first layer with its LiDAR. This lets you keep high speeds with far less ghosting.
6. Stabilize the printer and its surface
A printer on a flimsy or bouncy table feeds the table’s own movement back into the print. Place the machine on a heavy, rigid surface, and add vibration-damping or anti-vibration feet to absorb high-frequency buzz. A solid base is cheap insurance and sometimes removes the last bit of ringing that tuning alone cannot.
7. Reduce moving mass and mechanical play
Heavy or poorly balanced toolheads vibrate more. Remove unnecessary add-ons from the carriage, make sure cable bundles are not tugging on the head, and check linear rails or wheels for play. On wheel-based motion systems, adjust the eccentric nuts so the carriage rolls smoothly with no rock or slop. Worn rods, bearings or wheels should be replaced, because no slicer setting can compensate for a sloppy axis.
Frequently asked questions
Is ghosting the same as ringing?
Yes. Ghosting, ringing, echoing and rippling all describe the same vibration artifact — faint repeated lines just past corners and features. “Ringing” emphasizes the cause (the frame ringing like a bell); “ghosting” emphasizes the look.
Does filament cause ghosting?
Almost never. Ghosting is a mechanical/motion problem. Wet filament and bad flow create other defects (stringing, blobs, rough surfaces) but not the clean, evenly spaced ripples that follow corners.
Why do I get ghosting only after running input shaping?
If artifacts appear or worsen after calibration, rerun the resonance test — a loose belt or a printer that moved during the test produces a bad profile. Make sure the frame is solid and belts are correct first, then recalibrate.
Can I just print slower forever?
You can, and it works, but input shaping plus tight belts lets you keep most of your speed with clean walls. Slowing down is the best diagnostic and a fine short-term fix; tuning the hardware is the better long-term answer.