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Printing a ring to close the gap between the fan blades and frame

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post #1 of 21 (permalink) Old 04-08-2020, 11:00 PM - Thread Starter
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Printing a ring to close the gap between the fan blades and frame

Hi all,

I got new Case Sharkoon Pure Steel RGB and the included fans have ~2.5mm gap so the static pressure is poor.
I have decided to design a ring to attach on the fan to close the gap to improve the static pressure and I do see a great improvement- did any one else tried it too?
Ring OD:105.5mm
Ring ID:102.5
Fan frame ID is 106mm!.


link to 3d part:
https://www.thingiverse.com/thing:4271830
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Last edited by Hwgeek; 04-09-2020 at 12:08 PM.
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post #2 of 21 (permalink) Old 04-09-2020, 10:42 AM
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Interesting idea. Often the reason there is as much impeller to shroud clearance is because impeller enlarges as rpm increase .. also get larger over time, especially if fans run at higher speeds.

Please let us know how they work out for you.

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post #3 of 21 (permalink) Old 04-09-2020, 11:04 AM
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How did you measure the improvement? And did you also increase the noise? It's just that all these manufacturers can choose any "gap" size they please - I'm wondering why they've deliberately made them worse.


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post #4 of 21 (permalink) Old 04-09-2020, 11:07 AM
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i mean, can we see the improvement too?

as for why some manufacturers don't fine tune/ do something similar. you're applying logic where none exists. Just bottom lines, a e s t h e t i c, and deadlines.

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post #5 of 21 (permalink) Old 04-09-2020, 11:45 AM - Thread Starter
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I build a PC for Folding, GTX 1070 + Silverstone 1200W platinum with stupid fan curve that can make you go crazy.
Before the mod- the PSU fan would Kick in at 100% for ~30 sec every ~10 min and after the mod it maybe kick in for ~5 sec once in 1~2 hours, even adding 2nd GTX 1070 its not kicking in so hard any more.
Also they maybe leave such big gap sometimes for economy reasons (using same blade on other frames?).
it's low RPM fan also it has almost 1 mm gap after mod for long term expansion, I tried 102mm ID and it also fits.
Case has 4 fans at stock placement, 3 at bottom sucking air in thru dense dust filter and 1 at back to exhaust the hot air[positive pressure inside case].
Fan Spec's:
Fan Speed: 1200 rpm ± 10%
Bearing Type: Fluid Dynamic Bearing
Max. Airflow: 94.8 m³/h
Max. Air Pressure: 1.16 mm-H²0
Noise Level: 18.2 dBA
MTBF: Min. 50,000 Hours

Quote:
Noctua-News: What’s the point of using such a small tip clearance? Is it really worth the extra effort?
Lars Strömbäck (Noctua CTO): *laughs* Well, it has taken us more than one year just to sort out the manufacturing issues, so there were times when we were wondering if it’s actually worth the extra effort, but at Noctua, we always strive to push the boundaries and deliver the best solution that’s technically possible. We’re confident that our customers appreciate this and that’s what’s justifying the effort for us in the end. Technically speaking, the reason why you want to go for such a tight tip clearance is that when the fan operates against back pressure, such as on a heatsink or radiator, some air will flow back through the gap between the blades and the frame. The smaller the gap, the less of this type of leak flow you have, so narrowing down the gap helps a great deal in achieving superior performance on heatsinks and radiators.
https://noctua.at/en/nf-a12x25-interview-lars-stromback

Look at the gap on Noctua:
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Last edited by Hwgeek; 04-09-2020 at 12:18 PM.
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post #6 of 21 (permalink) Old 04-09-2020, 02:28 PM
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Quote: Originally Posted by Hwgeek View Post
I build a PC for Folding, GTX 1070 + Silverstone 1200W platinum with stupid fan curve that can make you go crazy.
Before the mod- the PSU fan would Kick in at 100% for ~30 sec every ~10 min and after the mod it maybe kick in for ~5 sec once in 1~2 hours, even adding 2nd GTX 1070 its not kicking in so hard any more.
Also they maybe leave such big gap sometimes for economy reasons (using same blade on other frames?).
it's low RPM fan also it has almost 1 mm gap after mod for long term expansion, I tried 102mm ID and it also fits.
Case has 4 fans at stock placement, 3 at bottom sucking air in thru dense dust filter and 1 at back to exhaust the hot air[positive pressure inside case].
Fan Spec's:
Fan Speed: 1200 rpm ± 10%
Bearing Type: Fluid Dynamic Bearing
Max. Airflow: 94.8 m³/h
Max. Air Pressure: 1.16 mm-H²0
Noise Level: 18.2 dBA
MTBF: Min. 50,000 Hours


https://noctua.at/en/nf-a12x25-interview-lars-stromback

Look at the gap on Noctua:
You are comparing apple to oranges mate. NF-A12x25 impeller was years in development because of impeller expansion as speeds increase .. so much so the impeller is made of a special material to help control expansion.

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post #7 of 21 (permalink) Old 04-09-2020, 02:37 PM
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I understand your logic.

It's just that... you're comparing a fan designed to light up, and a fan designed to cool. of course the one designed to light up isn't going to be as good.

it is however quite nice that you found an inexpensive way to hone the performance. They either never even thought about it, OR the QC is so bad, that it needs that much room due to variance

Quote: Originally Posted by doyll View Post
You are comparing apple to oranges mate. NF-A12x25 impeller was years in development because of impeller expansion as speeds increase .. so much so the impeller is made of a special material to help control expansion.
and this is why you don't paint your noctua fans.

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post #8 of 21 (permalink) Old 04-09-2020, 03:02 PM - Thread Starter
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I was never comparing those cheap bling bling RGB fans to this noctua fan :-), I just brought the explanation why it's expensive and how it's improves the fan.
it's just easy/cheap way[for 3d printer owners] to improve those cheap stock fans and I thought I should share.
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post #9 of 21 (permalink) Old 04-09-2020, 03:20 PM
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Whether you can scientifically prove the benefit or not its still pretty cool that we can spend hours designing (I'm still learning) bits and pieces to modify existing or build stuff from scratch in our own home, cool!
Some people don't know how to do encouragement...lol

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post #10 of 21 (permalink) Old 04-09-2020, 10:36 PM - Thread Starter
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I can build a test platform using jewelry scale to measure the static pressure delta, maybe later for fan :-)
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