I believe Bambu’s fan replacement instructions take about 2 hours to perform the first time, and this upgrade
adds maybe another 2 hours. But each subsequent fan change after this upgrade can be done in under 98 seconds.
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Will you also be making a video on how to modify an H2D to have this? like what measurements you need to cut the cover at, how to assemble the toolhead fan mount, etc.
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I applaud the effort and creativity, but is this the right answer? If cooling fans are failing prematurely shouldn’t we be pushing Bambu to switch to a fan that won’t fail?
Getting really good at swapping out a part just gives Bambu permission to not address the issue…putting the same junk parts on really doesn’t sit well with me. It’s normalizing deviation, and fans failing in the hundreds of hours IS deviation.
At minimum, it would be more in our interest to identify a higher grade fan that’s a drop-in replacement, or else redesign the fan mount to accept a different fan that will last longer.
The 3d print files also include a 23 page PDF document which has the details of the modification, along with a lot of tips on all the connectors.
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From my understanding they did address this early on. Who knows how many machines were shipped with the under performing lower heat fan or when exactly the change occurred.
But I can say I have many H2 machines only doing high heat stuff with 2000-3000+ hours on them without failure of this fan. The ones that did fail, probably because I only do high heat for the most part, only lasted a few hundred hours. So based on my experience, they changed something at some point and have addressed this. If not, I’d be extremely surprised.
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Thanks for the response, have we seen any instances of fans being replaced with (presumably) updated fans and those fans failing again?
It’s too bad we don’t have an easy way to know when the updated parts were cut in.
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Well, if this tells you anything.
I accumulated lots of H2s over a several month period and had 3 failures (112 hours, 280 hours, and 360 hours - the oldest machines I had at the time) and was so worried about this fan taking a crap that I ordered 6 fans for spares when they finally came back in stock.
It’s been well over 6 months since then and I still have all 6 spares lol. So yeah…
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Is there a method to tell if a fan is sleeve or ball, bearing? I saw something about the first fans being sleeve bearing.
So issue sorted then!
Out of curiosity, do you have the part #s from the old and new fans?
Interestingly enough, if you go by the picture of the replacement fan on the Bambu site, that company has been acquired, and I haven’t been able to find the fan element anywhere else - it appears this was a custom fan develop for this application, or at least is a very obscure item.
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This lines up with what I have as well. 1800 hours about 70% is high temp and the new fan is sitting in the box waiting on a failure. I was expecting it by now. Thanks for the data point, mine was December ‘25 ship.
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Well, that was the really wild thing.
I was expecting some sort of revised part number, a revision number, some sort of indicator to say it has been updated…, it’s physically IDENTICAL in every single way that I could find including the manufacturer sticker / part number etc., to the old one.
So without completely dissasembling the fan entirely as some sort of subassembly, I have no idea how one would ever physically identify the original vs updated one. That’s one of the reasons I threw all the old ones away lol.
Part Numbers that I have are;
YY4510H05B Snowfan decal
Y4510H05B No name decal
What’s up with the 2nd number? Is that one you found?
Here’s one still in the box I just opened (one of my spares) that I ordered after the store came back with these in stock.
From the Bambu repair guide, I see a “Snowfan” brand fan, but on the parts website it’s showing “Fengxin" brand.
My guess would be the Snowfan is the older version as Bambu typically produces their guides prior to launch or a new printer.
That said, the Snowfan website seems to say these fans are hydraulic BB type, and I suspect the Fengxin are the same.
Electrical leads have the same colors, but I can’t see the connectors on both.
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Appears the same in every way.
The one suspect fan I own is a Snowfan, which is running 760 rpm faster then spec (9460 rpm)
I’m meaning is that a fan you found or one from Bambu? I’m assuming it’s one you found instead of the BL store correct?
The one I showed is the one BL sells for spare parts.
Well, the one’s I replaced were all identical to the one I showed in the picture. Pretty sure they are updated. Since then, maybe the fan company changed hands, but they have been running for a few thousand hours now no issues. So maybe “both” things are true.
Would be interesting to see what fan you get if you ordered one from BL. I’m betting it’s the same package / part as I already have.
Yes, and the way you do that is to say to support “this isn’t a consumable item, it should have lasted the length of my warranty, you need to be the one replacing it, not me. Send me a shipping tag.” And yes, I have done exactly that. Over a fan that I could have replaced.
And also yes, it’s entirely within their rights to repair your unit and send the same one back, but in practice they never do, they just send you a new one.
If people keep providing Bambu Lab free repair support they will simply use the cheapest possible component in every location. What is the downside for them? It either limps through the warranty period or worst case they send you a new one and you provide the labor for free.
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They were from Amazon, listed as ball bearing 80c
I went through this. I got an ‘ball bearing 80C’ fan from amazon and a OEM replacement. Visually one can’t tell the difference until one peels the sicker back and then you can see the cut outs PCB look a little different. Not sure how to further dissect them. I really don’t know if i is an 80C fan or just someone putting that in the description to make sales.
Edit: clarification.