I was just thinking… Why isn’t it possible to connect a ton of AMSs you your printer? And break the 16 color limit. For example, we connect four AMSs to a hub, right? Then we connect four hubs to one AMS and start layering it up.
Logically the physical connections seem possible, I guess the limit is in the way the AMS’s are addressed in Firmware/software.
One item of concern, if there is a difference in feed rates between serially connected AMS units, that might cause a few issues.
I don’t see the problem in the feed rates. I said that they will be connected well and the filament feed will be calculated well. For example:
First AMS feeds at speed 1
Second AMS starts feeding at speed 1 when filament is detected
(Check if working by moving a little)
And repeat.
It’s like a belt, but with multiple motors driving it.
Software is okay. Eventually somebody should figure it out.
Off-Topic, but I am really interested: For which model do you need more than 16 colors?
The other question is, how much rainbow poop does the world need 
It isn’t always about having more than 16 colours in a single model.
I will not address the 16+ point, but, to your bigger argument, why do you need so many.
The benefits of an AMS or multiple is more than the colours of the filaments.
Other benefits:
Auto refill
You can have back up spools that will automatically used when the primary spool is used. This can benefit you when you are near the end if one spool or the job is large, will run for hours, possibly days, you can leave its refill task to the AMS and you do not need to hang around waiting for it.
You may need this for a four colour print with a fallback spool for each, you are now at 8 spool, or 2 AMS units.
Choices without swapping out
You may wish to keep a basic palette available. Think, black, white, grey, red, green, blue yellow, orange. That is 8 spools just to keep the basics in place.
Mix basic with exotics
Add a couple of metals, a galaxy, a sparkle, you remember you use PETG so you have 4 of those ready, then you’re are enjoying TPU for AMS, that is another 12. Add those 12 to the basic 8, and you are at 20 spools or one too many AMS you can possibly connect.
I understand there are people who prefer to constantly swap spools in and out, but, there are many who through efficiency or laziness (two sides of the same coin) benefit from many AMS units connected at the same time.
Your point is really smart, Malc! I saw some auto plate swapping machines, and the convenience of not swapping so much times manually is really something!
