marshall.b
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Pressure on Print Cooling Fan

Thu Jul 06, 2017 1:02 pm

I've been running into an issue lately where too much pressure on the print cooling fan on my MK2 (i.e. the pressure holding it down from the screws and the back of it up against the extruder assembly) causes it to progressively slow down over the course of the first several minutes of a print to the point where it's spinning so slowly it's nearly useless. I've done some tinkering with it to remove most of that pressure which has resulted in it printing fine so far. But I'm wondering why this is all of a sudden a problem 6 months into printing with the printer. Does this mean the fan is dying? Has anyone else had the same issue?

BEST ANSWER by joan.t » Sun Jul 09, 2017 7:39 pm
My original fan had sleeve bearings which dried out and gave the symptoms you describe. Taki g the label pff the back and lubricating before putting thr label back solved the problem for a while.

Eventually i replaced it with a ball bearing fan.

Rehards Joan

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henri.m
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Re: Pressure on Print Cooling Fan

Sun Jul 09, 2017 3:54 pm

Only thing comes to my mind is because over tightening screws that may cause fan jamming.

joan.t
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Re: Pressure on Print Cooling Fan

Sun Jul 09, 2017 7:39 pm

My original fan had sleeve bearings which dried out and gave the symptoms you describe. Taki g the label pff the back and lubricating before putting thr label back solved the problem for a while.

Eventually i replaced it with a ball bearing fan.

Rehards Joan
I try to make suggestions that I believe to be well founded and safe,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.

marshall.b
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Re: Pressure on Print Cooling Fan

Fri Oct 13, 2017 2:48 am

joan.t wrote: My original fan had sleeve bearings which dried out and gave the symptoms you describe. Taki g the label pff the back and lubricating before putting thr label back solved the problem for a while.
For some reason just saw this message the other day and just did exactly what you recommended and the fan is running well so far (I had rigged the fan up so it would run fine without screwing in the screws too far but it was somewhat sketchy so this solution is much better). Thanks!

joan.t
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Re: Pressure on Print Cooling Fan

Fri Oct 13, 2017 7:28 am

My Pleasure...
guess it's time to order a replacement.

I ordered one with ball bearings, its working fine!
I try to make suggestions that I believe to be well founded and safe,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.

joan.t
Posts: 676
Joined: Thu Oct 29, 2015 11:42 pm
Topics answered: 7
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Re: Pressure on Print Cooling Fan

Fri Oct 13, 2017 7:28 am

My Pleasure...
guess it's time to order a replacement.

I ordered one with ball bearings, its working fine!
I try to make suggestions that I believe to be well founded and safe,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.

walter.l
Posts: 6
Joined: Tue Aug 22, 2017 1:10 pm
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Re: Pressure on Print Cooling Fan

Fri Oct 13, 2017 3:12 pm

I had the same problem, with loud noises from the print fan, for the first few minutes of a print. I lubricated as described and it worked perfectly!!! :D
THANK YOU SO MUCH!!!

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