Hello community!
H2D shows resistance to high.
Would like to ask for a bit advice to opitimize.
Where should the 4-1 be mounted? the other AMS do not show that error.
Thx
switch your left right. put your ams units on the left side. remove that sharp bend between the inlet and the 4-in-1 adapter. small space workbench would always be challenging for multiple ams units. you have to use more brainjuice on it 
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As @hotellonely said…
I do not mount my 4‑in‑1 splitters or any of the PTFE tubes; they are free to move around, and I never have issues with sharp bends or filament pushing hard enough to create noticeable friction. On the other hand, my setup is definitely not visually beautiful, but the printer seems to love it.
I have four AMS 2 Pro units on the right side of my printer, with the 4‑in‑1 splitters placed quite close to the AMS 2 units and one 4‑in‑1 connected to the bypass port. My AMS HT units (currently six in total) are on top of the printer and are connected to both the left and right nozzles.
The real trick is to avoid sharp bends or tight passages that might pinch the filament if the PTFE moves while the filament is being fed.
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demounted the 4-1 and tried to not bend the tubes, hanging free.
immediately the HD shows the error again.?
is this a design problem of the HD inside to the ceramic ?