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Rattle Y Axis ?  

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NickRno77
(@nickrno77)
Trusted Member
Rattle Y Axis ?

I hope you can help and I’m in the right place to ask a question, this week when printing there is a rattle. Its usually is worse at the begging of the print and rattles less as the print rises. I have attached a video of the print which you can hear the noise quite easily. I thought it might be the extruder but after more analysis I think it’s the bed and y axis. If I tap the bed when the y axis is in middle of stoke I notice a rattle, also there is play up and down. 

I've lubricated all the shafts as per instructions and still get the noise. I’ve only had the printer for 3 weeks built as a kit.

 

Posted : 24/04/2020 2:43 pm
Pteppic
(@pteppic)
New Member
RE: Rattle Y Axis ?

Had a similar problem with my X-axis. I kept adding lubricant, which fixed the issue for a while.

Recently i had to disassemble the printer-head to replace one of the fans. As i took the head off of the rods i was greeted by 4-5 tiny metal beads, which had escaped from the bearings (these were the source of the noise).

I had a few 8mm polymer bearings lying around from a different project, so i substituted these for the broken metal ones. This fixed the rattling as well as it made the whole head move more quietly, almost completely silent.

So, of course, i bought some more and replaced all the LM8UUs (few more were almost worn out). Now the printer is beautifully quiet and doesn't need lube every 4-5 days.

 

Can't say for sure if this helps with your problem, it sure helped for me though

Posted : 05/05/2020 3:13 pm
NickRno77
(@nickrno77)
Trusted Member
Topic starter answered:
RE: Rattle Y Axis ?
Posted by: @pteppic

Had a similar problem with my X-axis. I kept adding lubricant, which fixed the issue for a while.

Recently i had to disassemble the printer-head to replace one of the fans. As i took the head off of the rods i was greeted by 4-5 tiny metal beads, which had escaped from the bearings (these were the source of the noise).

I had a few 8mm polymer bearings lying around from a different project, so i substituted these for the broken metal ones. This fixed the rattling as well as it made the whole head move more quietly, almost completely silent.

So, of course, i bought some more and replaced all the LM8UUs (few more were almost worn out). Now the printer is beautifully quiet and doesn't need lube every 4-5 days.

 

Can't say for sure if this helps with your problem, it sure helped for me though

Thanks for the info, I ended up completely rebuilding the Y Axis and now seems to be a lot quieter but still rattles a little. Since then I've built the Bear X Axis and Extruder hasn't made a huge difference but does seem a little quieter. I'm feeling I get better prints.

On the way to rebuilding the Y Axis, I tried PLA Bearings and Plastic Retaining cups but found the bearings didn't run very smooth on the rods so I went back to the original, I guess PRUS must use U Bolts for a reason, probably less fussy on tolerance?

Posted : 05/05/2020 4:26 pm
Elephant Shoes
(@elephant-shoes)
New Member
RE: Rattle Y Axis ?

@nickrno77

I have the same issue and it is coming from the bearings on the Y/Bed and have a little knock when you twist the bed.

Built Pursey a few weeks ago with no issue and after 40hrs of printing....., boom the most anoying rattle.

I have tried contacting Prusa but no ansewrs yet which is very dissapointing.

Have you had any help or managed to sort out the problem?

Regards,

Posted : 19/06/2020 11:06 am
Pteppic
(@pteppic)
New Member
RE: Rattle Y Axis ?

I've replaced my LM8UU-bearings with IGUS polymers. So far I've had no luck with printed bearings (i've tried PLA and PETG) due to somewhat random tolerances. If the u-bolts are tightened just right around the igus - like the the original prusa - it runs super smooth and dead silent.

I'm sometimes worried if the printer is still running because i can barely hear it anymore...

Posted : 19/06/2020 2:20 pm
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