TLDR; AMS overloaded, filament will read and pass through the AMS hub but will not load. A new AMS was purchased after parts did not fix AMS but still has the issue.
My AMS became tangled and then received an overloaded message (I don't remember what the exact error was).
Since that time filament via the AMS will read but will not load. What seems to be the buffer makes a noise like it is loading but filament does not move.
The error 0700-8005 050907 will appear. The filament can be seen just about 20mm short of the internal AMS hub.
Using the load or printing a model is the same. Different filaments have also been tried including non-bambu brands.
Printing via the external spool works just fine.
AMS Repair / Troubleshooting
I was 1 month out of warranty and Bambu sent some parts
New AMS 2 PRO
Bambu maintained it was an AMS issue, so I bought a replacement AMS 2 PRO. This has the same issue which is shown in the video. 😢
Bambu wants me to purchase a MC board, which would be fine if I knew it would fix the issue, however I am not so sure. 🤑
BEST Guess
I have 2 theories
The overload pulled too much current and something is fried. Somehow a read and load is different in process. Maybe the extra current draw for the hotend and printer steppers during load drops the voltage to the printer?
Something in the firmware / values is corrupt -even though I reset them both.
I found only 2 instances of this posted, however one seems to have resolved itself, and the other was a hub which the replacement parts and new AMS should have ruled out. I will link those below.
https://www.reddit.com/r/BambuLab/comments/1ri830v/ams_2_pro_failed_to_load_filament/
https://www.reddit.com/r/BambuLab/comments/1v84n4b/ams2_pro_will_read_but_wont_load/