PET-CF not AMS Compatible?

Why is that?
What about it makes it not-compatible with the AMS?

From the AMS product description:
“Avoid flexible materials with the AMS because they can get stuck. These include TPE, TPU, or damp PVA. Glow-in-the-dark, particle-infused, or filaments with carbon or glass fibers may be brittle and break inside the AMS, or be abrasive and prematurely wear the internal parts.”

Thanks for that - however PETG-CF, PA-CF, PLA-CF, etc are all abrasive as well… yet they OK to use in the AMS.
So is it the brittle nature?..

What is “so unique” about the PET-CF material that makes it different and specifically not compatible with AMS?

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I think the real issue with the PET CF is how brittle and abrasive it is. CF PLA and PAHT CF are pretty flexible (only slightly brittle) and shouldn’t break in the AMS’s twists and turns, so they are fine to use in the AMS. But the PET CF’s brittle nature is too much to take the tight radius turns in some parts of the AMS line. Additionally, it is abrasive too, maybe a little more so than the PLA and PAHT CF’s. So you would be replacing PTFE more often if you were able to get it to flow without breaks in the filament.

That’s only my guess, but I don’t use any filaments that are brittle like Polymaker LW PLA, PET CF, old PLA, etc. in the AMS and definitely limit how much abrasive filaments I load in.

Well I tried it anyway… it worked fine during the print, but the AMS could not rewind it reliably at the end. Sometimes it worked sometimes it didn’t. I got the AMS unable to rewind - check fro broken filament error. But when I checked the filament wasn’t broken at all.

I noticed when feeding it in from the outside feeder, that it’s very stiff (like metal wire almost) and does not like any curves in the feeder tube unless the curvature is the same as the filament coming off the spool. The amount of friction was quite significant from that. I think the AMS just couldn’t pull hard enough to overcome that friction from the head all the way back to the AMS…

Would filaments that are not compatible with the AMS be ok with just the AMS buffer? I currently have my X1C setup with a Y splitter pre-buffer to allow both the AMS and an external spool to pass through the buffer.