Hi, the fan in my pi-top 4 died and I’m searching for a replacement. I have searched and even though there was somewhere a mention of a partnumber, I am not able to actually find that. As it seems to be a 30x30x7 3 pins fan, finding something similar is pushing me in the dark corners of AliExpress but can’t seem to find a proper fan that has the right connector and such.
I’ve found two topics on the forum from a few years ago, but they either got a tip about using some oil or where it was picked up by support, so those aren’t helpful to me right now 
The tech-spec simply states; Integrated 0.9 Watt centrifugal cooling fan (30 x 30 x 7 mm)
Is someone able to guide me to a proper fan replacement? Many thanks in advance!
As I’m only allowed one picture right now, I tried to pick the most explanatory one
Welcome @SnakeMind!
Not sure whether this will suit as the power profile is about two thirds of the stated 0.9W spec but how about https://www.digikey.co.uk/en/products/detail/sunon-fans/4127-MF30060V1-1000U-A99/9838567 ?
Thanks! And yeah, I’ve found some other 2pin fans that would come close, but that would end the fancontrol functionality I think. It’s very hard to find fans that are 30x30x7 with 3 pins like the original one (and also the right connector!)
This is the connector it has, and as I don’t think I could replace that easily it would be useful to have a fan that has the same connection
Ah. Yeah I failed to note the two wire cable instead of three…
Alright, @pi-topJorge @RezIN @angus could really do with your help here!
It can’t even be the 30x30 fan component as used by RPi here because the fan thickness is pretty much 10mm so presumably too thick for this application
I found this fan with the same dimensions in three wire control on Ali Express
DBM3507S 3.5CM 35mm blower fan 35x35x7mm 3507 DC5V 0.15A 3pin Small Slim Cooling Fan for Micro Devices Projector
https://a.aliexpress.com/_EzJrujI
I then de soldered the cable as it was too short, and the connector was of a different style and used the original fan connector.
Finally, I modified the upper side of the fan to provide airflow for cooling of the battery by drilling nine holes
I would suggest buying a couple of spares at the same time in case you make a mistake or it wears out.
Neat job! Thank you for this helpful contribution to the pi-top community 
Although, you said it’s the same dimensions but it says 35mm rather than 30mm? Have you successfully fit it into your pi-top [4] case?
the original fan in my pi-top [4] case was 35x35x7, thus an like for like on size.
Interesting. I don’t have my pi-top [4] to hand, would you be willing to measure the fan in yours, @SnakeMind ?
I’m wondering whether there’s been a hardware revision… If it turns out there hasn’t and @SnakeMind’s fan (along with all of ours) is actually 35x35x7 then, @SnakeMind could mark @b-m-weller’s post as a solution to this thread.
And if 30x30x7 is what pi-top themselves have written in their spec then they need to correct their spec!
Sorry, I wasn’t doubting you! I was wondering whether @SnakeMind could do as you’ve kindly just done so we can see whether there has been a hardware revision or not. Either way, pi-top clearly need to update the spec on their Knowledgebase!