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I have this fan model, it is a SUNON model number MF50151VX-B00U-A99 and it is a blower type.

enter image description here

When the head is moving in the X-axis it makes noise.
I think this type of fans is not suitable for rapid movement and rapid changes in directions.

I think the noise is coming from the axial of the fan because I think there is a clearance in the axial for moving up and down.

When I put my finger on the fan body(the rotating part) the noise stop!

My question, What type of fans suitable for rapid movement and rapid direction change? and if this is not the problem what is the problem in my situation?

I have tried searching but I can really find a direct answer!

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    $\begingroup$ Julging from the picture, I'd guess the very small area where the blower is attached to the head may play a role, as it let it free to vibrate and resonate. $\endgroup$ – mac Mar 11 '18 at 12:48
  • $\begingroup$ I have realized this just after wrote my questions but still not sure about it, I think this fan is not suitable for rapid movement changes! $\endgroup$ – Muhammad Nour Mar 11 '18 at 13:44
  • $\begingroup$ well you said the noise stops when you put the finger on the rotating part (so, I guess stopping the fan), but what happens if you put the finger on the case (so, the fiked part of the blower)? if the noise stops or decrease dramatically, there you have it: the problem it's not the fan but the way is mounted on the printing head. :) $\endgroup$ – mac Mar 11 '18 at 15:25
  • $\begingroup$ I did that and it is not making any noises, good observation, thanks $\endgroup$ – Muhammad Nour Mar 11 '18 at 16:50
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As discussed in the comments...

The problem with the fan seems to be its flimsy attachment to the printer head. The fact the fan chassis is not firmly kept in place allows for it to act as a soundboard, amplyfing whatever vibration nomally occurs in the motor.

You could probably get a fan that is more silent in the first place (noctua is a known brand for silent fans, and it is used on the Original Prusa MK3 for example), but since there's nothing inherently wrong with your current fan, I would simply design a custom, more beefy mount for it. For added dampening effect you could also use small o-rings as washers for the screws.

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In response to Answer from MAC above. The Sunon Maglev Fan is actually an exceptional fan that is superior in all aspects from static pressure, CFM, Decibels... far superior to that of a radial fan like a Noctua.

http://www.sunon.com/index2/uFiles/file/03_products/08-catalog%20download/Sunon%20DC%20Brushless%20Fan%20&%20Blower_(240-A).pdf

The noise probably comes from the way it’s been attached.

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