RE: MK4 Factory Assembled - Bad Bearings?
Would you mind posting a photo of what you did to stop the noise, please?
Mine did this the first print out of the box. I traced the noise to the power supply and on inspection, it was the toroidal inductor (there's only one in the one I have) making the noise due to vibrations caused by very specific stepper motor speeds. I stuck a small piece of silicone tubing between it and the transformer next to it and that has prevented that vibration and stopped the noise.
Standard disclaimer - I don't recommend anyone take apart their power supply.
RE: MK4 Factory Assembled - Bad Bearings?
Update 10:
It sounds like from the last update there are a number of other revisions being considered due to early feedback. I would assume they're all small, but their support seems to be ragged right now.
When dealing with the escalated team of developers, designers, and techs on their side I had the chance during some dead air to ask how IS was going. It sounds like it's going to be in alpha quite a while longer, or have a lot of beta iterations.
The impression I got was they're finding too much variability in the algorithm and it's either going to require end-user calibration or have a generic value that takes away some of the finer details like others have implemented.
RE: MK4 Factory Assembled - Bad Bearings?
Update 11:
Prusa's support team stated they are "overwhelmed" so not expecting any major progress over the weekend. I do have a callback tomorrow so can't say there won't be some news, but they don't have a fix right now. They are playing around with currents on the toolhead components, but that's seen as more of a work around than fix.
RE: MK4 Factory Assembled - Bad Bearings?
@Jeremy - maybe inform Prusa of the below as a possible avenue for investigation?
Mine did this the first print out of the box. I traced the noise to the power supply and on inspection, it was the toroidal inductor (there's only one in the one I have) making the noise due to vibrations caused by very specific stepper motor speeds. I stuck a small piece of silicone tubing between it and the transformer next to it and that has prevented that vibration and stopped the noise.
Standard disclaimer - I don't recommend anyone take apart their power supply.
--> MK4 - MK4S - MINI+ - Accelerometer Guide <--
RE: MK4 Factory Assembled - Bad Bearings?
That was one of the first things tested, along with the Y axis. The issue is confirmed to be within the toolhead carriage.
RE: MK4 Factory Assembled - Bad Bearings?
Hi Jeremy, any updates from support?
RE: MK4 Factory Assembled - Bad Bearings?
Just posting to say I have this problem, too. Since the first print. I'll submit a report to Prusa to add my name to the list.
RE: MK4 Factory Assembled - Bad Bearings?
Update 12:
From the sounds of it, beyond those that had issues out of the gate (a "sizeable" number per escalated tech), support has gotten quite a few inquiries over the past 4-5 days of those that are experiencing the issue after a week of printing without it.
The second largest complaint they've had (according to the escalated tech) is issues with very pronounced ringing/ghosting. Many of the users are coming from the MK3 line so to complain would indicate an issue.
They're still trying to determine a fix but took the weekend off so are back at it today.
RE:
Just posting to say I have this problem, too. Since the first print. I'll submit a report to Prusa to add my name to the list.
The tech had me tighten all the screws around the hot-end/extruder. There were quite a few that were rather loose. Not falling out, but definitely can safely tighten more. They also had me open the electronics control box and make sure the screws holding it to the frame were tight.
I also noticed the same power supply noise that @dp250f made note of. I squished a piece of silicon where they described. I then unscrewed the PSU from the machine and placed some silicon o-rings and then secured it back. Now it sets about 2mm off and it cradled by the silicon. The combination of these changes have dramatically quieted the machine down. Unfortunately, I forgot to take a picture of the inside of the PSU.
Side note: I also reported my nozzle gouging the print sheet. They had me reseat the nozzle/hotend. We'll see if that helps.
RE: MK4 Factory Assembled - Bad Bearings?
Just a thought could there be something overtightened maybe the fan shroud enough to touch the blades?
RE: MK4 Factory Assembled - Bad Bearings?
I had played with every level of tightness on every screw and bolt for 12 hours one day (16 hrs total), there isn't a combination I didn't hit - from less than hand tight, hand tight, to plastic bending and everything in between. Unfortunately nada.
RE: MK4 Factory Assembled - Bad Bearings?
I then unscrewed the PSU from the machine and placed some silicon o-rings and then secured it back. Now it sets about 2mm off and it cradled by the silicon.
The PSU frame attachment provides stability to the printer's x-axis frame. This is why, for example, the "Prusa Original Enclosure" installation includes adding a new bracket, in place of the power supply, when detaching the power supply and moving it outside the enclosure.
I am concerned that adding silicone washers between the power supply and frame would diminish the stability of the x-axis frame, thereby causing ghosting or other anomalies in the print. Have you done any tests for this since adding silicon washers to the power suppy?
RE: MK4 Factory Assembled - Bad Bearings?
Interested to see whether a 'properly' built kit also has this issue, as that would determine whether it is a build issue by Prusa engineers slacking when tightening bolts etc.......
--> MK4 - MK4S - MINI+ - Accelerometer Guide <--
RE: MK4 Factory Assembled - Bad Bearings?
You would think they would have these issues ironed out prior to public release considering they said they have been running hundreds of MK4's in their print farms for the past year already!
But alas, at least they had a weekend off to chill and relax huh!
Update 12:
From the sounds of it, beyond those that had issues out of the gate (a "sizeable" number per escalated tech), support has gotten quite a few inquiries over the past 4-5 days of those that are experiencing the issue after a week of printing without it.
The second largest complaint they've had (according to the escalated tech) is issues with very pronounced ringing/ghosting. Many of the users are coming from the MK3 line so to complain would indicate an issue.
They're still trying to determine a fix but took the weekend off so are back at it today.
--> MK4 - MK4S - MINI+ - Accelerometer Guide <--
RE: MK4 Factory Assembled - Bad Bearings?
Mhhhh, that sound is somehow familiar to me.
I think my printer do (or was doing) the same, I will check. Is sound like it is coming from one or more bearings. It may be some defective bearing balls, or there is space from the balls and the the rod, and the vibrations of the balls cause the sound. That may be due to inaccurate quality of the bearings, or the rod is too small in diameter compared to the one expected by the bearing. Replacing the defective bearing could solve the issue.
Keep in mind that it may be the opposite also: bearing balls too near the rod, and they are scratching the rod metal! In fact from the picture resolution, I can barely distinguish (but I see) the horizontal sign of the bearing balls on the rod.
- Is this just grease scratch or the scratch affect also the rod metal? Clean up the rod from grease and look closely if there are visible scratch on the metal.
Best Regards.
RE:
If anyone is having the ringing / ghosting issues Jeremy mentioned, there's a topic started for the MK4's (link below). Please share any issues and / or fixes you may have!
RE: MK4 Factory Assembled - Bad Bearings?
TIL the power brick is a key stability item for the X axis. I did a couple prints and no noticeable issues, yet. I'll do some more printing and see if I can find any issues. When I put the spacers in I did tighten the PSU screws as much as I could. The idea I had was that a part of the PSU was barely touching the frame and thus hitting it just right to vibrate occasionally. All screws are in-place and tight, but now it's far enough away from the frame that it can't rattle against it. I have a hunch the PSU will still provide the needed rigidity since it is still screwed in, but I'm going to continue to test and monitor.
RE: MK4 Factory Assembled - Bad Bearings?
Update 13:
Had another session today... learned a lot but didn't make progress on this specific issue.
1 - Input Shaper is still having the issues I mentioned several updates back. They are finding more variance between machines than anticipated so their "generic" algorithm isn't providing the best output. They're going to continue to work on it but the end result will have some "smoothing" effect to fine details. They do plan on having an accelerometer available at some point down the road. The actual public stable release of IS sounds like a long ways off.
2 - They're getting a number of complaints/inquiries regarding ringing/ghosting but are treating it as an issue that will be addressed by IS, no beforehand.
3 - They're making numerous revisions to the toolhead carriage based on the issue being discussed in this thread as well as other feedback. Most other printed parts are still on initial version.
RE:
Between this issue and the divoting of the build plate, I canceled my MK4 order (placed in March) yesterday. Not really into paying >$1k to be a beta tester.
I'll reconsider the MK4 once they've worked all this out.
RE: MK4 Factory Assembled - Bad Bearings?
Just as a data point, I’m luckily not experiencing this issue (heavy knock on wood). I’ve been printing almost nonstop since it arrived 10 days ago. I attached a video similar to @jeremy-3 for reference (my fan sounds noticeably louder, guessing that’s my phone and/or enclosure).
I’m also not experiencing the divot issue @matthewjschultz pointed out. I have noticed the nozzle leaves tiny divots of filament where it probes, which I really thought was sheet damage at first, but it turned out I could just scrape them off.
Sounds like not all machines are effected, but they clearly have some that aren’t right.