I have done a number of Upgrades, Mods or Hacks on my H2D, and it seems to me that someone on Bambu’s design team was intending for these changes to be possible. For example, with the hotend fan they placed the fan and wiring near one side of the toolhead with only plastic blocking access. This is not the only example, there are many.
You can have the entire toolhead on the desk in front of you in less than 10 minutes. The belt clips / rail screws (all screws you need to access for this job)can all be taken out easily with a cordless screw driver).
Then you have more screws for the buffer, some covers that pop off to expose a few wire clips and connectors.
It’s not difficult. Would make it easier to do the fan for those unsure of themselves.
For me, as long as you have a good lighted magnifying glass, it’s about a 15 minute job for the hotend fan without removing the gantry.
Some people would rather have a nice easier environment to work on something than from the top and angled down looking behind. But the time amount doing either way is not much.
All the screws are easily accessed, the connectors for the cables all pop off easily etc.
Hardest part is reconnecting the ribbon cables if you’ve never worked with them before. But about impossible to do without some sort of magnification IMO. That’s a need not a want for a magnifying glass. Nice set of ribbon tweezers helps for sure as well.
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It’s not about the difficulty of the job, but rather absurdity of removing the toolhead or gantry for a fan replacement job.
As already stated, some people may find it easier doing it that way since the part then can be on a desk in front of you for convenience, but it is not a requirement.
And as already stated, it’s not about a specific difficulty of this job, but rather about the idea, that there was some engineer at Bambu that overdesigned something so simple as a fan replacement into a crazy process that would require to do anything beyond just +/- 4 screws and one pwm connector.
If you think this design is fine, then I guess you are one of those people like VW/Audi engineers who create something similarly stupid in their cars. Or Land Rover.
“To replace spark plugs, you have to separate body from the frame of the car, because it’s easier than to do it differently”
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To perform a repair / part replacement in 15 minutes is not a hard or overengineered job for any type of repair.
You aren’t removing a body from a car in 15 minutes so no idea why the over dramatic comparisons that have no basis on the this discussion.
You clearly don’t understand much about engineering.
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Because you clearly don’t understand an engineering design? The fact that you don’t even see a correlation is hilarious.
Yo, no comments. I don’t want to derail this discussion further.
The fact that you are trying to claim taking a tool head off in 10 minutes is the same type of comparison as removing an entire body off a car for a set of spark plugs, and then doubling down on this comparison is FAR MORE hilarious.
Thank you lol
Id dare you to replace headlight bulbs in my old Alfa Romeo Giulietta in 15 minutes
I would like to see a video of someone changing a H2 hotend fan for the first time in 15 minutes, they can choose any access method they prefer.
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Beautiful machine you have there don’t want to insult it but it’s not a Mitsubishi is it ? Kinda reminds me of an evo lancer. I know on the Alfa the battery, battery tray have to come out and you still have to break your wrist in 2 places to get your hand in there 
being Italian it hated electric things must have blown a headlight every 4 months at least. Still loved it though
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How to insult a ford guy by telling it’s not an insult lol. Perfect hahaha.
No, he has Fraud Mustang from the end of 90s there, judging by the rear wheel, drag racer wannabe. 
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Still a beautiful machine though. Don’t make cars like they used to. Sure alot more power now days but they lack the flair
My kidneys hurt just reading that speed.
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BBL has sent me a new fan, new board - one of the boards in there. I don’t know which one. It’s the one that has the wire that runs all the way back to the AMS.
I replaced it all - turned it back on. Tried my first print. Same failure. Now what.
TH board is the internal board with long wires attached by solder.
Bring us up to speed, what is your issue?
What was the error code, I don’t think Bambu normally sends out a TH board for a fan failure
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Middle of a print I got this error. Opened a case and sent my logs
They told me to tear apart the hotend and check connections. I did. Same error. Send the logs
They said they are shipping me the new equipment.
fan, the board, some ribbons.
I replaced it all. Same issue. I’m completely lost what to do. This thing is just a brick now
I never had any odd noise or anything.
Here is the message from them
We are pleased to inform you that your replacement Cooling Fan for Hotend1,TH Board FPC Cable1,H2D TH Board1,2004 Switching Motor Unit1 has (have) been shipped by USPS.
After receiving the package, please refer to the following wiki article for replacement/installation guidance:
Replace H2D Cooling Fan for Hotend and Bracket | Bambu Lab Wiki
Replace H2D Extruder Connection Board/TH Board/FPC Cable | Bambu Lab Wiki
Replace H2D Extruder Connection Board/TH Board/FPC Cable | Bambu Lab Wiki
I would ask Bambu to give you the whole toolhead. Offer to send your toolhead back for them to troubleshoot.
The whole double head unit ? I’ll respond in my ticket. I assume there are instructions how to take that whole thing apart.