For space reasons, I would stack both the AMS and the high-temperature AMS on top of the H2-D Pro. However, I am worried because the printer vibrates a lot during printing, particularly if you set it up to print quickly. I’m worried that the high-temperature AMS may fall off. Is that a valid concern? Would it make sense to concoct some kind of retainer to make sure that this doesn’t happen?
I use both of my AMS2 on top of my H2C but the HT sits to the left in front of the external spool holder.
No issues from this set-up.
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Edit: Addendum: The stacking solution for the AMS2 requires additional space, so the HT would need to sit in front of the AMS2 stack. That is why I have it off to the side.
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I am tight for space also. I have the H2C and I purchased the Panda perch set up. I have 2 AMS 2 pro’s on top and 4 AMS HT’s ( 2 on each side). It works great. The Panda perch quality is great and is all metal. We all know that on some prints with short quick travels that the H2’s can some time shake a good bit for a few seconds. I have have not had any issues with my Panda Perch set up.
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This is very interesting, thank you. But how do you connect more than 2 AMSs? The back of the printer has only two tube inlets, no?
You’ll need a 4 way splitter. This will allow you up to 4, or a combination there of. They’re available on the store, or you can find ones to print on Makerworld.
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Thank you! Given that these 4→1 buffers cost just a few bucks and seem to have spring retainers for the PFTE tubes, I presume that it’s better/easier to buy them instead of attempting to make them.
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Absolutely. My grey 4-in-1 on th X1 has been flawless during probably 3000h. The black 4-in-1 on the H2 is coming up to 1200h. And it does seem to be very effective at cleaning the filament as well. Had some teething issues with AMS resistance/heat creep. One side of the PTFE-path is now black, the other still pristine 
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I have 2 of the 4 in 1 PTFE adapters. One on the right nozzle connecting to my 2 AMS 2 Pro’s and one on the left nozzle connecting my 4 AMS HT’s.
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It is safe to stack them, but keep in mind the amount of weight you are adding to the top of your system.
I keep my four AMS 2 Pro units on the right-hand side of the printer and my four AMS HT units on top of the printer without any issues. I keep the AMS HT units on top because they function as external spools for the bypass, and that setup gives me the shortest and smoothest filament path.
Also keep in mind that every junction you add, such as 4-in-1 splitters, increases friction in the system, so it is best to keep them to a minimum.
I print everything from TPU/PEBA 65A to PPA/PPS through my AMS HT with absolutely no issues. The only change I made was replacing the original PTFE tubes with lower-friction ones. In my setup, there has been no need at all for the TPU Assist, and I do not believe it should be necessary for others either, provided friction is kept low. I did, however, buy the TPU High Flow kit, but only to reduce friction when printing TPU.
I’m just not gonna skip the possibility to install top mount for tpu direct feeding. (Other than be able to do a good and easy cleaning and maintaince.
AMSes are on the side of the printer
I purchased the Panda Perch but never ended up using it! lol - still brand new in its box. Need to get it sold really. Anyways, I moved my printer and have shelves directly above it for the AMS units now, but prior to that I had AMS on top and it was perfectly fine - its how Bambu show the printer on their marketing material!
I’ve been looking at the Biqu Perch. The issue I have with the Perch, is I like the ability to remove the glass top and to look inside from the top the H2D for issues, setting up laser engraving jobs, cleaning etc. The Perch with the AMS will prevent that clear top down access to the H2D although you can remove the glass top.
I have installed the TPU assist, but I will routing the TPU assist thru the internal buffer as the back port is already occupied by the air assist tube from the laser upgrade.
My main reason for wanting the Perch is to reduce the distance from the AMS to the yet purchased the Filament Track Switch which has a recommended distance of 27” from the AMS’s. My current setup is slightly over around 30-36” with no issues with the current distance.
The Perch does have good selling points which includes reduce AMS’s distance and efficient placement of the AMS’s.
Intuitively, I would expect that increasing the weight tied to the printer (perch + >2 AMS) should reduce the vibration during printing by adding inertia. But raising the center of mass may induce the opposite. So, we will see… 
I would definitely run a new “Vibration Compensation” calibration to compensate for the weight.
Still I think that the constant change in weight on the top of the printer might counteract the VC calibration at some point.
On mine the feet for my AMS 2 Pros just barley go into the holes on the Perch. They slide around a lot. How do your feet fit? Did you need to do anything fancy? Thanks