How to Fix Ringing and Ghosting in 3D Prints

Ringing in 3D printing — also called ghosting, echoing or rippling — is a repeating wave pattern that appears on a printed surface just after a sharp feature such as a corner or a hole. It is caused by mechanical vibration in the printer when the toolhead changes direction. Fix it by tightening belts and stiffening the frame first, then lowering acceleration and outer-wall speed, then enabling input shaping.

If you are seeing wavy ripples on your 3D prints, particularly around corners and other sharp features, you are dealing with an issue called ringing or ghosting. This common surface flaw isn't random; it is the direct result of vibrations from your printer's moving parts. The good news is that you can eliminate it methodically. This guide presents a clear, step-by-step process, starting with simple slicer settings and moving on to physical hardware checks, to help you get much smoother, cleaner prints.

Step 1: Confirm the Print Artifact is "Ringing (Ghosting)"

Before you can fix the issue, you must be certain about what you are seeing. Ringing can sometimes be mistaken for other print quality problems, and a correct diagnosis is the first step toward the right solution.

What Ringing Looks Like

Ringing, also known as ghosting or rippling, appears as a series of wavy lines on the surface of your print. You will usually see these faint ripples right after sharp features, like 90-degree corners or holes in the model. They look like echoes that fade as they move away from the feature that caused them.

The Cause: Printer Vibrations

The simple cause of ringing is mechanical vibration. Your printer's motion system, particularly the print head, has weight and momentum. When it is moving and then has to change direction suddenly, the force of that change creates tiny vibrations in the printer's frame. As the nozzle continues its path, it transfers this shaking motion onto the print, creating the ripple effect. Faster speeds and sharper direction changes will make the vibrations more noticeable.

Is it Ringing or Something Else?

Proper identification prevents you from applying the wrong fix. Four surface defects get confused with each other constantly. The distinguishing question is always where on the part does it appear, and does it relate to the geometry?

• Z-Wobble: This issue presents as a consistent, repeating corkscrew or layered pattern that extends up the entire vertical height of the print. It is not linked to specific features like corners. Z-wobble is caused by a misaligned or bent Z-axis lead screw, which creates a regular, predictable deviation on each new layer.
• Inconsistent Extrusion: Problems like nozzle clogs, filament diameter variations, or a poorly calibrated extruder lead to random surface defects. These can appear as blobs, gaps, or areas of under-extrusion. Unlike the regular, feature-based pattern of ringing, these flaws are typically erratic and do not correspond to the print's geometry.
• Layer shifting: if an entire portion of the print is displaced rather than rippled, that is a different failure with a different cause — see our guide on how to prevent layer shifting.

Step 2: Measure the Ringing Before You Change Anything

Ringing has a frequency, and that number is what modern firmware needs in order to cancel it. Measuring it takes one small test print and a pair of calipers, and it turns the whole job from guesswork into arithmetic.

The standard method comes from the Klipper resonance compensation documentation: print a ringing tower, measure the physical distance covered by a run of ripples, and divide.

Repeat for the Y-marked face — the two axes usually have different frequencies, because they move different masses. One useful side effect of this test: if the ripples do not follow the notch pattern on the tower, what you have is not ringing at all, and no amount of input shaping will help. That is your signal to go back to the identification table above.

Step 3: Set Your First Line of Defense in the Slicer Software

Start with your slicer program to fix ringing the fastest. These choices tell the printer how to move, and they often work very well without changing the hardware.

1. Reduce Print Speed (Especially for Outer Walls)

Cutting down on your print speed is one of the best ways to stop ringing. When a print head changes direction, it makes more vibrations because of its high speed, but this force is greatly reduced when the head slows down. Pay attention to the "Outer Wall Speed" or "Outer Perimeter Speed" setting in your slicer because it has a direct effect on the quality of the end surface. Change the speed by a lot, like from 60 mm/s to 40 mm/s, and then print a test model to see what happens.

2. Lower Acceleration and Jerk Values

These two settings control how aggressively the printer changes speed and takes corners. Lowering them results in smoother movements that create fewer vibrations.

• Acceleration: This controls how quickly the printer gets up to speed. If it's too high, movements can be jarring. Try lowering your "Print Acceleration" values by 25-50% from the current setting.
• Jerk (or Junction Deviation): This setting determines how much the printer slows down for corners. A high jerk value is a primary cause of ringing. Try lowering the "Jerk" value (e.g., from 10 to 7). If your slicer uses "Junction Deviation," lowering that value will have a similar smoothing effect on corners.

3. Change the Print Order to "Outer Wall First"

You could also try changing the order of the prints on the wall. If you set your slicer to print the "Outer Wall First," the viewable surface is printed before vibrations from the inner walls or infill can affect it. This can help hide small rings. Keep in mind, though, that this is just a visual fix; it doesn't fix the vibration problem underneath; it just makes things look better.

Step 4: Check Your Printer's Mechanical Stability

If your software adjustments didn't completely fix the ringing, the cause is likely a physical issue with the printer itself. A wobbly frame or loose parts will amplify vibrations, overriding even the most careful slicer tuning. This is worth stressing, because it is the step people skip: input shaping is a correction applied on top of a sound machine, not a substitute for one.

1. Stabilize the Printer's Surface and Frame

Start with the printer's foundation. Make sure the machine is placed on a heavy and completely stable surface, like a sturdy workbench or even a concrete paver stone, to help absorb vibrations. Next, inspect the frame itself. Go over every screw and bolt that holds the structure together and tighten anything that's loose. Grab the top of the frame and try to rock it. If you feel any wobble or flex, find the source and secure it until the entire assembly feels rigid.

2. Inspect and Tighten the Belts

Loose belts are an extremely common cause of ringing. If the X and Y-axis belts aren't tight enough, they create slack that allows the print head to oscillate after a sudden stop or turn. Belts should be taut, making a low "twang" sound when plucked, similar to a bass guitar string. They should not be loose enough to sag, but also not so tight that they put excess strain on the motors. Use your printer’s built-in tensioners for adjustment, or manually tighten the belts at their mounting points. Belt width and pitch matter here too: wider, stiffer belts stretch less under the same load, which is why current CoreXY machines such as the QIDI Plus 5 use 9 mm 1.5GT belts and a linear rail on the X axis rather than wheels.

3. Check for Wobble in Wheels and Pulleys

Finally, check for any play in the moving components. Firmly grab the print head and the print bed and try to wiggle them. If you feel any looseness or rocking motion, you need to adjust the eccentric nuts on the wheels. Turn the nuts in small increments, just enough to eliminate the wobble while still allowing the carriage to glide smoothly. You should also confirm that the drive pulleys on the motors and the idler pulleys on the opposite ends of the belts are fastened securely and do not wobble.

Step 5 (Advanced): Firmware and Hardware Upgrades

If you've done all the mechanical checks and still want to print faster or get an even better finish on the surface, you can change your printer's software and hardware.

1. Use Input Shaping in Firmware

Input shaping is an open-loop control technique that shapes the motion command so it cancels its own vibration, and it is the most effective tool available for ringing. High-tech firmware, like Klipper or newer versions of Marlin, implements it directly. A small accelerometer sensor is briefly attached to the print head as part of the process, and you run a test that reports the printer's own resonant frequencies — or you measure them by hand with the tower method in Step 2. The firmware then uses those frequencies to modify its motion in real time so the vibrations largely cancel out. This is what lets a machine print at much higher speeds and accelerations without the surface falling apart.

Two caveats are worth knowing. First, the documentation is explicit that ringing usually has mechanical origins — a flexible frame, loose or springy belts, misalignment, heavy moving mass — and those should be fixed first if possible. Second, resonance can drift: a frequency you measured six months ago may no longer be right after belts have settled. If ringing reappears on a machine that was previously clean, re-measure before re-tuning.

QIDI machines run a Klipper-based firmware with input shaping already in the pipeline, which is why the current lineup can hold surface quality at speeds that would have been unusable a few years ago — the Plus 5 at 600 mm/s and up to 20,000 mm/s², and the Max4 at 800 mm/s and up to 30,000 mm/s². Whether that speed is worth using on a given part is a separate question, covered in our look at FDM printing at 600 mm/s.

2. Make Hardware Modifications

Since vibration force scales with moving mass, reducing the mass of the toolhead directly reduces ringing at a given acceleration. On older machines that usually means a lighter hotend and print head assembly. Some users also replace a V-slot wheel motion system with linear rails, which are stiffer and hold alignment better under the side loads that cause deflection at high acceleration. Both are real improvements, but both are also things a modern machine tends to have solved at the design stage — a rigid CoreXY frame with rails and a light toolhead is the whole point of the architecture.

Attain Smoother Prints Through Methodical Action!

Fixing ringing is a straightforward process when done in the correct order. Always start by checking your printer's physical hardware: a stable base, a rigid frame, and properly tightened belts. Once the machine itself is solid, then move to the slicer by lowering outer wall speed, acceleration and jerk. For the best possible results or to enable faster printing, measure your ringing frequency and use input shaping. By working through these stages methodically, you can successfully eliminate ringing and achieve consistently smooth surface quality on your prints.

Frequently Asked Questions

What causes ringing in 3D printing?

Mechanical vibration. When the toolhead changes direction quickly, its momentum flexes the frame and belts; the nozzle keeps printing while that oscillation decays, so the wave gets written into the surface. Anything that increases moving mass, reduces stiffness or increases acceleration makes it worse.

What is the difference between ringing and ghosting?

There is none — they are two names for the same defect, along with "echoing" and "rippling". Klipper's own documentation lists them as synonyms. Different slicer and printer communities simply settled on different words.

Does slowing down always fix ringing?

It reduces it reliably, but it treats the symptom. Lowering outer wall speed and acceleration cuts the energy going into the frame, and on a mildly loose machine that is enough. If the belts are slack or the frame flexes, you will keep having to go slower and slower, which is the signal to go back to the mechanical checks.

Can input shaping fix ringing on a badly built printer?

Only partially. Input shaping cancels a predictable resonance at a known frequency. A loose pulley or a wobbling carriage produces motion that is not a clean resonance, so the shaper has nothing consistent to cancel. Fix the mechanics first, then measure, then shape.

How do I know my ringing frequency?

Print a ringing test tower with acceleration increasing in bands, count N oscillations across a measured distance D in millimetres, and compute f = V × N ÷ D, where V is the outer perimeter speed in mm/s. A tower printed at 100 mm/s showing 6 oscillations across 12.14 mm gives roughly 49.4 Hz. Measure X and Y separately.

Why did ringing come back after months of clean prints?

Usually belt tension. Belts relax slightly over time and fasteners work loose from constant vibration, which shifts the resonant frequency away from what your input shaper was tuned for. Re-tension, re-check the frame, and re-measure the frequency.

Can filament choice affect ringing?

Not the vibration itself, but it changes how visible the result is. Glossy filaments reflect light in a way that exaggerates every ripple, while matte finishes hide them. If a part is close to acceptable, printing it in a matte filament can make the difference — though that is cosmetics, not a fix.

From Fixing to Upgrading

As you've worked through these steps, you may have discovered that some components on your machine are worn, damaged, or simply not up to the task of high-quality printing. This is a natural part of the 3D printing journey. Sometimes, the solution lies in upgrading key 3d printer accessories; even a small change, like swapping to a high-performance nozzle, can make a significant difference. Don't forget the foundation of every great print: high-quality filament for 3d printer. Using one of the best 3d printer filaments ensures that your machine's perfect movements translate into flawless surfaces. And if you find yourself constantly battling the limitations of an older machine, it might be time to consider what a good 3d printer, built with stability in mind, can offer. Investing in quality components or one of the latest 3d printers is the final step towards achieving professional results.