Z-Axis Vibration  

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rod.t
(@rod-t)
Active Member

I've just assembled my Mk3S kit and it all went together nicely, but when I started it up for the first time and ran the setup and calibration I was concerned about the level of vibration when the Z-Axis moves. In particular it rattles the LCD assembly, which I have fixed by wedging some thin card into the PCB mounts but the vibration is still a concern. Some suggestions I've tried have been to loosen the Z-axis motor covers and check the Z-Axis top supports but nothing seems to help.

I must admit to being somewhat disappointed as the Mk3S is claimed to be so quiet but its noisier than my Anet A8 which it was intended to replace!

Is this a common problem and are there any ideas out there for fixing it?

Posted : 09/05/2019 10:17 am
vintagepc
(@vintagepc)
Noble Member

Post a video - it doesn't sound normal. The nature of the noise may help ID the problem. 

Without further info, sounds like there may be a screw loose somewhere. Do NOT loosen the Z mounts and leave them loose - that will only make other things vibrate.

 

Posted : 09/05/2019 12:39 pm
vvv850
(@vvv850)
New Member

Mine does the same thing from the first minute. I received it on Friday, assembled it on Saturday, and until today it was basically printing all day long. 

Calibration is perfect, all values below the minimum requirement.

The prints are excellent (including first layer) and everything seems fine except the huge vibration on the Z axis when it is lowering the extruder to home. During prints and slow movement on Z, it doesn't do this.

It seem to be coming from the motors though, and not a mechanical binding (everything moves smooth). Lastly, it is amplified by the LCD casing.

I will post a clip tomorrow

Posted : 09/05/2019 11:45 pm
Vojtěch
(@vojtech-p6)
Honorable Member

Happens on mine, too. Even more so when I replaced the Z motor mounts with much more solid aluminum ones. I fixed the display resonance by using a double sided tape between the LCD and the display board PCB and some hot glue on the case. Then the bed started resonating when Z is moving fast. Fixed that by adjusting the Y rods to preload the bearings a little. But then the table which the printer is on resonates. The Z motors simply vibrate too much when moving at speed. I guess I'll adjust the Z printer speed limit and be done with it.

Posted : 10/05/2019 12:09 am
Tim
(@tim-m30)
Illustrious Member

You might check that the dust washers on the lead screws aren't rubbing on the motor case.  They are about the only place friction can really build up.   The only other spots that rub are the upper supports, or a cross threaded T-nut.  

This post was modified 1 year ago by Tim
It is always wise to get more than one opinion......
Posted : 10/05/2019 2:04 am
vvv850
(@vvv850)
New Member

https://photos.app.goo.gl/M8uW4sS48wpZzhQ56

The dust washer are ok and when rotating by hand I feel no friction. The printer is on an Ikea Lack table which amplifies the sound.

Posted : 10/05/2019 12:35 pm
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