PPA from AMS HT

This review is interesting. Look like he was able to feed PPA directly from AMS HT without using the bypass hole. I guess if the path is straight enough it will work.

Around 8min mark.

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Looks like it uses A1 Series style filament buffers instead of X1.

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The buffers are built into the H2D itself, so you only need the splitters you see. You can even print your own if you are in a rush.

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are these 4-to-1 splitters generally going to be the recommended way to connect multiple AMSs to one nozzle? i assume there’s no other official hub-type accessory for H2D?

Have a look here: H2D introduction | Bambu Lab Wiki.

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Also noticed they added the 4-in-1 ptfe adapter to the H2D upgrades page: Accessories | Bambu Lab USA Store