When I bought the X2D, it was always with the intention of eventually utilizing high temp filaments. I bought two rolls of ASA and initially had issues printing with both. I have the filament track switch (FTS) mounted vertically and my AMS HT sat on the table next to the printer. So there was a long tube with a 180* bend going onto the FTS. I was getting “high resistance” errors when I was printing with some filaments. To fix the issue I moved the AMS HT higher up so it sits above the printer which allows for a shorter path to the FTS. I still have a 180* bend coming out of the HT but it is at the start instead of the end and I made the bend more gradual. This change along with twice drying the ASA filament, allowed me to finally print ASA successfully.
I love ASA now! It adheres well to the BIQU Glacier plate and the print pops off as soon as the plate cools. ASA prints look much nicer than PETG. So while I was initially wary of engineering filaments, I am now excited about them.
My question is what other filaments should I be looking at for printing in the X2D? I want to continue to be able to use my existing configuration which means the filament must be compatible with the FTS and the AMS HT. Bambu wiki is somewhat inconsistent in its recommendation as it says in one place that a filament cannot be used with AMS or FTS and then says elsewhere that it can. I assume that it is because one place assumes generic filament and the other assume Bambu filament. Assuming I buy Bambu filament, what other high temp filaments have people had success (or issues) with on the X2D?
Almost anything from Fiberon
Honestly, I’ve had generally very good experiences with most filament manufacturers. Buy most of my standard filaments from SUNLU, including PLAs and their HighSpeed PETG.
For ASA, I’ve actually had really good results with both BambuLab ASA, as well as FlashForge ASA.
FlashForge ASA-CF has printed phenomenally on my P1s from my AMS HT.
I did just get two spools of SUNLU Easy PA in, but haven’t had a chance to test it yet.
I think most of the time when Bambu docs said some filament is incompatible with AMS, it is when it is too abrasive or/and too brittle or in case of TPU too sticky and flexible. And then they show AMS HT as compatible but via the direct feeding hole and not via all the PTFE tubes.
In general the whole idea of AMS 2 PRO to be incompatible with the PRO filaments and not capable to even dry engineering materials and even Bambu’s own support for PETG and PLA is kind of confusing. Then they bundle them with all PRO printers … so it seems like Bambu count PLA and PETG printing as PRO. And all else is something else 
.
And they have equipped their PLA and PETG (A1/2 series) printers with open AMS with limited colors and not able to even dry - AMS light …..
Honestly I am not sure what they are doing.
This PRO/Engineering printers should have come with AMS HTs or similar 4x units in bundle and separate or kind of better paths. But it is what it is.
In general when you read the specs you need to be careful for AMS HT - PTFE vs direct path feed. And as far as I understand it direct feed has no AMS functionality ( no auto load or unload ) , but work via direct feed line or directly to the extruder.
I have printed TPU for AMS successfully via PFTE tubes from the HT. Only thing I did was use a new nozzle as I read that it is best for TPU to not use nozzles used to print other filaments. Not sure how accurate that statement is.
I do have a roll of 90A TPU but have yet to find a need to print with it. Once do, I will use the TPU feed hole out of the back of the HT along with a TPU assist module I bought (and assembled myself) from Bambu. Apparently, TPU should only be printed on the Left nozzle. I am hoping all goes well as it sounds like it can get pretty messy when it does not.