Anyone can give me an advice on this?
If the price of upgrade kit for H2D is lower than H2S’s one, it makes sense.
What are the letters for? Maybe D is less at something than S.
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Arguably the H2C will have more advantage for those wishing to print mulitcolour both in terms of time and poop as soon as you go above 2 colours.
Looking at the video BL put out for the nozzle changer that is the H2C it will require some work to fit the mechanism to a H2D both on the toolhead and panels off to run cables to the main circuit board.
H2S will need a new toolhead, filament buffer at least to get the C standard.
Price wise there is no way Bambu will make it cheaper to go the H2C spec via the H2S compared to the H2D - look as laser costs as an upgrade kit versus the factory version.
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A “DP_lover” guy asking about "D"s and "S"s … username checks out! 
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my predection:
~3000€ for the H2C Combo with one or two autochanger Hotend(s)
~800€ for the H2D upgrade kit with one or two autochanger Hotend(s)
~1600€ for the H2S upgrade kit with one or two autochanger Hotend(s) where you basically have to go from an H2S to an kind of H2D and finally to the H2C.
I think printer (H2S/H2D) + upgrade kit will be more or less the same as just buying the H2C directly. If you dont buy the H2C directly, you will “pay” with your time for the upgrade.
This is a preliminary announcement from BambuLab – as they themselves wrote, “the first attempt.”
I wouldn’t even bother thinking about what the upgrade will cost today and what advantages and disadvantages it will have, because even BambuLab certainly won’t be able to answer those questions.
And until the system is introduced, I’m not even sure whether there will be an upgrade for the H2D and H2S – because “technically possible” doesn’t necessarily mean it will come and make sense.
For my part, I’ll watch the whole thing when it’s released and then wait for the “second attempt” of a good solution.
Furthermore, the only European 3D printing manufacturer has announced a tool changer for one of its latest models…
Confident BL do know exactly what the costs are - there own blog post states the hardware was ‘locked months ago’ and software has been the hold up instead.
They’ve also stated upgrade kits will be made available but it’ll be cheaper to buy a H2C instead of upgrading a 2D or 2S model - you’ll have to pay for the extra hardware on the toolhead instead of the difference between the 2C and 2D/2S hardware cost.
Advantages are clear too, up to 7 colours in a print and only a purge tower instead of poop waste.
Disadvantages are less build volume which hits the 2S hardest.
My 2D already has the mounting points in its chassis to fit the Vortek when comparing the released video positions, there are several unused connectors on the main controller board with a cluster of 3 in the top left, ie where you would be looking to connect the hotend swapping mechanism to.
All of that makes it clear BL had the hardware side of this ready prior to H2D release and manufacture. I’d put some money that the 2C was the model they wanted to launch the H series with but it was taking to long to sort the software.
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