Mk3S - Noisy Print Fan - Questions & Feedback...  

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ytene
(@ytene)
Active Member

Hey everyone,

I've had my i3 Mk3S for a couple of months now and am consistently impressed by the print quality. As my experience grows and I've got that dialled in, I want to turn my attention to resolving some really (*really*) annoying issues - and would appreciate any help or guidance the community would care to give...

First issue is the angled print fan on the hot end. for reasons I don't pretend to understand, this fan is stupidly, stupidly noisy. Best way to describe it would be to say that it has a "death rattle" when its running. I know this isn't a smart thing to do... but if you use a fingertip to gently press on the centre of the fan and reduce it to a near-complete stop, the entire printer becomes silent - it's generating *that* much noise. So: first question - is this common? Is there a set of checks or procedures I can run to see if I can get my fan to quieten down?

Second issue is that although I have (today) ordered a replacement print fan... looking at the assembly mechanism and the fact that the cable for the print fan has to be "dis-entangled" from the main cable routing back to the Einsy board... I'm starting to think that it might be a *lot* easier to cut the cable to the existing fan [as close to the fan as possible] and then solder or crimp a 3-pin socket to the end of that cable and trim back and solder a plug on the replacement fan when it turns up. This should in theory give me the ability to relatively easily swap my print fan in future, should the replacement fail as quickly as this one has... I wonder if anyone has tried anything like this - and if so, what their experience was?

Third issue is likely nothing more than a thought for anyone from Prusa surfing these forums: why not simply get a multi-way connector and run a single multi-way cable to the print head? It might make the mechanism a bit more reliable - and it would certainly make it *much* easier to maintain...

Obviously I'm asking some fairly narrow questions here, because this *seems* like the best way to go about the process of replacing the print fan. However, if anyone has come up with a neater solution, I'd be grateful for guidance.

Thanks in advance.

Best Answer by JoanTabb:

Hi Ytene, 

If you undo the two screws retaining your print fan, you should find a label on the rear of the fan. 

if you peel this label back it should reveal a hole in the middle of the housing. 

Drop a little light oil, say sewing machine oil. into this hole, replace the label and refit the fan, you should find that it runs quietly once more, and you should have peace and quiet whilst you await the supply of your new fan. 

I have had similar issues and on my Mk2... which admittedly has 12 volt fans with no feedback, I did source some fans with Ball bearings instead of plain bearings. 
I bought two, and so far the first replacement is still running... about 4 years after I fitted it. 

I have spares for My Mk3. but to be honest I don't recall whether I actually sources ball bearing versions with tacho feedback. 
So far, neither of my Mk3's have needed new fans. (Fingers crossed they don't fail now...) 

regards Joan

This topic was modified 5 months ago by ytene
Posted : 27/09/2020 8:55 pm
JoanTabb
(@joantabb)
Moderator

Hi Ytene, 

If you undo the two screws retaining your print fan, you should find a label on the rear of the fan. 

if you peel this label back it should reveal a hole in the middle of the housing. 

Drop a little light oil, say sewing machine oil. into this hole, replace the label and refit the fan, you should find that it runs quietly once more, and you should have peace and quiet whilst you await the supply of your new fan. 

I have had similar issues and on my Mk2... which admittedly has 12 volt fans with no feedback, I did source some fans with Ball bearings instead of plain bearings. 
I bought two, and so far the first replacement is still running... about 4 years after I fitted it. 

I have spares for My Mk3. but to be honest I don't recall whether I actually sources ball bearing versions with tacho feedback. 
So far, neither of my Mk3's have needed new fans. (Fingers crossed they don't fail now...) 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 27/09/2020 10:46 pm
ytene liked
ytene
(@ytene)
Active Member

@joantabb

Brilliant advice - thank you! Sewing machine oil duly ordered....

Posted : 27/09/2020 11:10 pm
ytene
(@ytene)
Active Member

Quick update for anyone who finds their way to this thread and is interested...

I ordered a small vial of Singer Sewing machine oil from Amazon [not the cheapest, but a reputation for strong quality] and followed Joan's directions. The process was pretty straightforward, but I did find that the small adhesive label on the underside of the fan did not want to stick back down after being carefully peeled back, so I improvised with a small length of electrical tape.

The results are "night and day" and noise from the printer has been virtually eliminated.

Very happy with that!

Thank you Joan...

Posted : 01/10/2020 6:54 pm
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