Z-Axis Vibration  

RE: Z-Axis Vibration

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.

RE: Z-Axis Vibration

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

RE: Z-Axis Vibration

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.

RE: Z-Axis Vibration

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.  

RE: Z-Axis Vibration

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.

RE: Z axis vibration

Has anyone found the issue with this problem? I just bought a brand new Prusa3+ and it was vibrating out of the box. It is bad enough I can hear it from upstairs. I see no loose bolts or nuts. I have greased everything possible. You can lift the z while in off position and make it vibrate by hand but I can not tell where it is coming from. It is no doubt in the z axis and I am wondering if not having guides on the top of the lead screws could cause this. I am getting ready to post a crappy note to Prusa for their terrible service.

Did you grease your Z axis bearings before you assembled the printer

There are many vibrations that can be hard to chase down.  The einsy case can vibrate in sympathy, the motor mounts can vibrate in sympathy.  The cover for the control panel can vibrate in sympathy.  The BALLS IN THE BEARINGS definitely vibrate in sympathy if you didn't pack them with grease before assembling the X axis assembly (where it holds the 4 LMU8 bearings).  Not prusa's service team's fault - they can't run it down one sympathetic vibration.  Your thin topped lack table BOUNCES in sympathy to the vibration - which amplifies the noise and amplifies the sympathetic vibrations.

Want a quieter experience?  Put on a set of squash ball feet, and put the printer on a solid surface like a stone block.  Some people put soft rubber feet on stone tablets and then squash ball feet (two yellow dot) to quiet the noise.  I had a quiet printer and then added it to an enclosure - which started sympathetic amplification (thin bottom and walls) - so I added squash balls under my enclosure too.

RE: Z-Axis Vibration

I purchased my MK3S+ kit a few months ago. I assembled it myself and was very careful not to overtighten anything. I cleaned the slide rods out of the tube as they were covered in dust/debris. I did the same for the threaded rods. My printer was whisper quiet up until a few weeks ago. I started getting the same heavy z-axis vibration in both directions. I went through and checked all of the fasteners in relation to the z-axis and everything felt fine. My printer is in my house in a clean environment. I've even done a full calibration. In my opinion, it seems like something is off with the z-axis stepper motor firmware settings. It runs nice and quiet on "Stealth Mode", but I know this operation works differently. I'm not sure what the specs are of the threaded rods are and how compatible they are with the stepper motors "steps per revolution", but I wonder if that has something to do with it. While it doesn't seem to be affecting my prints, it is very annoying. I can't exactly pinpoint the date on when it started, but oddly enough I feel like it started after the most recent firmware update, but I can't say for certain. Looking at this thread, it seems like it has been an issue long before the update.

Has anyone made any headway on this apart from adding foam or squash balls?

RE: Z-Axis Vibration

Genau das selbe Problem. Druckt aber hervorragend. Aber wenn ich in der Nacht drucken will wirds zum Problem.

RE: Z-Axis Vibration

Stamperà anche bene ma una stampante che dovrebbe essere l’eccellenza non può dare questi problemi. Ho controllato e ricontrollato tutto. Ho il problema sull’asse Z rumorosissimo. Il problema c’è e deve essere risolto da Prusa

RE: Z-Axis Vibration

I suggest that you contact the Prusa helpdesk via chat

the helpdesk agents don't usually come here... 

what you could do is to add a video, in this thread, and refer to it, when you contact chat!

regards Joan