This is interesting and now I am going to have to do some research, because I use a lot of Bambu Lab Glow Flament and have never had an issue, but it does appear that several people have mentioned wear issues as being the problem, but both of my AMS units aren’t showing any wear at all but I only have 42 hours on one and 400 hours on my other unit, but niether one shows any wear issues at all so I will count my bkessings and hope this issue isn’t really a specific issue with their PLA Glow filament because I love the stuff.
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Someone mentioned that it could be in the re-winding of the spool where a lot of the wear happens due to the extra tension, and so if you do multi-colour stuff with glow, it may significantly increase the wear rate. Are you doing a lot of filament changes with glow?
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Yes, I do a lot of muticolor printing with Bambu’s Glow Filament. I have stuck to Bambu Lab’s approved lost when using filament in my AMS units. If there is even a question on whther it is supported then I use the external filament feed.
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Have printed 8+ spools of pla glow with zero issues of ams funnels getting worn out (just checked). Bought printer on kickstarter deal, 2126 print hours.
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I use eds_3d_shop AMS feeders and cleaners. They are not mods, but simple clip-on pieces that massively improve AMS feeder performance, keeping the filament dust free before it is fed and provide good relief for the filament as it enters the funnel. These would not void your warranty as they are not mods, in the big sense of the word, but more akin to being helpers. They work and are great,
EDS 3D Print
@teddy.mcsnuggins Welcome back to the forum. 
I wasn’t aware you had the power to speak for Bambu Labs. However, I’d prefer to see it writing from BL. Until then, it’s still just hearsay. And it doesn’t matter what any of us say one way or the other.
You have a valid point to the “no-mod” modification, and I use it myself. But I’m willing to forgo the warranty for the sake of my arthritis and a better wear point for all four of my AMS units. 
would be interesting to know whether the AMS2 Pro also has the same problems with the PLA glow, it now has the ceramic inlets/funnels, but maybe other parts are the same as in the AMS and they would also be damaged after some time
I’ve been running glow through the regular ams with a funnel protector mod and it seems to be going fine, I’d guess AMS 2 will be fine also
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If Bambu Labs are introducing new abrasive filaments like the glow type that cut into the plastic feeder funnel, maybe it’s time for Bambu Labs to introduce a stainless steel top part of the feeder funnel for the filaments to run smooth and handle the wear and tear of abrasive filaments better?
I have two AMS 2 pros so interesting that Bambu Labs would still be warning about using the glow filament is this wasn’t an issue anymore.
The warning is probably still there because the original AMS is still available for purchase as well as the countless number of users still using them. Also Glow filament is still abrasive and will wear other things such as PTFE tubes at a higher rate in both systems.
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Not sure when this was updated, but this covers things nicely. OP may wanna try hitting BL up for some free parts since they’ve effectively admitted their old guidance was wrong based on this edit.
They did send me a new feeder assembly 
(a long time ago now)
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Looks like Panda makes a ceramic protector as well
Amazon - Panda AMS pro protector
Adding a guide is not a “mod”. Also, Bambu Studio will tell you very clearly that Glow filament might damage that area and asks you to confirm that you have been advised. Tell the WHOLE story next time.
That’s all there was to the story TWO YEARS AGO. 
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