Bambu Lab Printer Noises: What's Normal and What to Fix

All printers, printing

Likely cause

The extruder can't push filament through. Bambu lists clicking as a sign of extrusion failure, and clicking or grinding as a reason for extruder maintenance (debris in the gears, filament deformed by heat near the drive gear).

First step

Pause the print and check the screen for an HMS error such as Extruder Motor Overload. Then clear the clog and clean the extruder.

On BambuHub: Clogged nozzle guideExtruder maintenance

Source: Extruder Maintenance Guide: Cleaning and Lubrication; Troubleshooting Extrusion Failure During Printing

X1 and P1, print start

Likely cause

Bambu describes this as the toolhead hitting the frame on its way to the purge chute during print preparation, an XY homing problem.

First step

Power off and move the toolhead by hand. Resistance or jitter front to back points to the AB motor or the Y axis; trouble only left to right points to the X carbon rods.

On BambuHub: Carbon rod cleaning

Source: X1/P1 Homing and Leveling Failure Troubleshooting

A1, moving

Likely cause

Steel bearing balls fell out of the X-axis linear guideway, for example while it was taken apart.

First step

Put the balls back with Bambu's repair guide before printing again. Bambu warns of lower X-axis accuracy and abnormal sliding noise otherwise.

Source: Repair Guide for Accidental Fall of Steel Bearing Balls on the X-axis Linear Guideway

X1, P1 and P2S, moving, printing

Likely cause

Dust, filament particles or lubricant residue on the idler pulleys raise resistance and noise. The X1 and P1 have 12 of them.

First step

Clean the idler pulleys (X1, P1) or lubricate them (P2S, every 3 to 6 months), then run the full calibration. If the XY axis makes abnormal noise or jams, Bambu says to stop the printer right away.

On BambuHub: Routine maintenance

Source: How to Clean the Idler Pulleys of a 3D Printer; P2S XY-Axis Idler Pulley Lubrication Maintenance

X1 and P1 (carbon rods), moving, printing

Likely cause

ABS and ASA leave residue on the carbon rods and inside the bearings, which raises resistance.

First step

Clean the rods and bearings with IPA. Bambu suggests it after every 5 rolls (5 kg) of ABS or ASA, or when ribbing shows, and says you'll hear the difference once they are clean.

On BambuHub: Carbon rod cleaning

Source: How to clean the carbon rods for Bambu Lab Printers

A1 and A1 mini, moving

Likely cause

The Y axis runs on metal guide wheels and a rail. Bambu says it needs regular lubrication and cleaning to reduce wear and noise, and to check the lubrication right after unboxing.

First step

Oil the Y-axis rail; Bambu also uses oil against noise from the idler wheels. Never put grease on the X-axis linear rail.

On BambuHub: Routine maintenance

Source: Guide on how to lubricate the A1 Y-axis guide rail; Guide on how to lubricate the A1 mini Y-axis guide rail

A1 mini, moving

Likely cause

Bambu's repair guide for a squeaky A1 mini heatbed treats two spots: the eddy current coil under the bed and the Y-axis belt.

First step

Power off, remove the Y-axis rear cover, grease the eddy current coil and oil the Y-axis belt, then move the bed by hand to test.

Source: A1 mini Squeaky Heatbed Repair Guide

A1 mini, moving

Likely cause

Bambu says regular maintenance of the X-axis idler pulley prevents abnormal noise and abnormal resistance, and schedules it every 3 months.

First step

Service the idler pulley as described in Bambu's A1 mini maintenance guidelines.

Source: A1 mini Maintenance Guidelines

P2S (rare, says Bambu), moving

Likely cause

The contact point between the Z belt and the Z belt tensioner idler.

First step

One very small drop of oil at that contact point. Bambu warns that more can make the Z axis misbehave.

Source: P2S Belt Tensioning

P2S, moving

Likely cause

The braided sleeve of the heatbed cable rubs on the rear panel. Bambu calls the noise unintended and has fixed it in newer production batches.

First step

Compare with the audio clip on Bambu's page, then wrap that section of the cable with electrical tape or put smooth, thick tape on the panel.

Source: P2S Heatbed Cable Noise and Solutions

X2D, layer change

Likely cause

At layer changes and area switches the Z axis rises; Bambu points to friction at the Z-axis tensioner.

First step

Update to firmware 01.01.01.00 or newer and repeat Motor Noise Cancellation. If it stays, grease the Z-axis tension sliding block.

Source: Solutions for Abnormal Noise During Wiping For X2D

H2 series, H2S and X1 (documented), printing

Likely cause

A worn fan. Bambu lists a squeaking chamber exhaust fan (H2), a squeaky auxiliary part cooling fan (H2S) and abnormal noise from the MC board fan (X1) as reasons to replace the fan.

First step

Find out which fan it is, then follow Bambu's replacement guide for exactly that fan.

Source: Replace H2 Series Chamber Exhaust Fan; Replace H2S Auxiliary Part Cooling Fan; Replacing the MC board fan

AMS lite, ams or spool

Likely cause

The spool claws of the AMS lite can squeak.

First step

Take the rotary spool holder apart and grease it as in Bambu's guide. Put the spring back exactly in place, or the spool rewind stops working and overload errors follow.

Source: Squeaky AMS lite Spool Claw Repair Guide

AMS 2 Pro, ams or spool

Likely cause

Bambu's first check for noise or stiffness is the support shaft: dust, debris or misalignment.

First step

Inspect the support shaft and clean it with a soft brush or an air duster.

On BambuHub: AMS jamming guide

Source: Bambu Lab AMS 2 Pro Maintenance Recommendation

X1, P1 and P2S (documented by Bambu), calibration

Likely cause

Vibration compensation: the motors shake at rising frequencies to find the resonance. Bambu calls it a frequency sweep and says it makes noticeable noise with a rising pitch.

First step

Nothing to fix. Bambu recommends calibrating after moving the printer, after firmware updates or maintenance and after hardware changes, so expect the sound again then.

Source: X1/P1 Series belt tensioning procedure; P2S Belt Tensioning; Printer Calibration Guide

X1 series (Bambu's example), printing

Likely cause

The chamber fan keeps the chamber cool for PLA. A chamber that runs too warm causes heat creep and clogs, so the fan is doing its job.

First step

Lower it in the fan controls on the printer screen, or in the filament profile (Bambu's example: S255 to S128 runs it at 50%). Don't fit a muffler: Bambu says the back pressure can damage the fan, and too low a setting can cause clogs.

Source: Bambu Lab Mods to be cautious about