Hi…
my new A1 Mini AMS can barely load filament. 4 is loading but not able to feed into extruder, feeds and then it clicks… 1, 2 and 3 load but feeds filament only a few cm into the tube and then it clicks… When i try to load to nozzle it gives a filament error…
Contacted Bambu 4 days ago - no reaction. pretty normal 
So now i try it here… 
2 Videos: Dropbox - ams - Simplify your life
Its normal that the first push after pushing filament into the feeder is only a few cm.
But obviously, it should feed all the way when you start the print. I noticed that you are not using the original PTFE tubes, right? Any chance you can try with the original once?
I had the same issue on my A1. You wouldn’t be using Matte Filament by chance, would you? And the AMS top mount? I was and found that #4 would not load Matte, but would load everything else. The matte has more friction and the motors couldn’t load it once it was deep into the Bowden tube. even if I manually loaded it in.
All other materials have so far worked, and matte loaded fine on all other payoffs. Then I noticed that the #4 has a sharper curve to it bending down to the machine.
Then I noticed I had the printed tube braces that come with the AMS top mount kit, reversed. The long ones should be in front, the short ones in back. This has fixed that issue for me.
So check your tubes, look for sharp curves, and if you can move your AMS around and relive that bend, you may have better results.
Bambu Wiki and a friend telling me that the mini feeds Filament about 40cm into the tubes…
The Original Tubes are a little to short. But i tried the ams lite laying on my legs without any fricton on the tubes - same result… 
No, its normal PLA+… I can try longer ptfe tubes but they seem to be good.
Showed my videos to a friend who has also the ams lite and he says it sounds “weak”…
5 Days now and no response from support! 
If you use the chatbot during Chinese business hours, you should get the option to enter a live chat.
To get there, you need to ask your question and after a few messages, it will ask if it was helpful, give a thumbs down.
Just found this thread that might help…
Ams is now completely dead/offline.
Waiting for Support…
Also even without ptfe tube no feeding power… this device is faulty. I hope they replace it…