I have my Bambu A1 set up in a very tight space, so I made use of the AMS Micro by emics to mount my spools vertically.
The printer is able to reliably load and unload filament from all four spools, but during printing (especially slot 4, the topmost spool), particularly after retractions, the extruder will be unable to re-insert the filament and will throw an "extruder is not extruding normally" error. I can manually push the filament in until it's grabbed by the extruder after which the print will continue normally until the next retraction.
The spools spin freely on the stock AMS hubs and the PTFE tubes are short and not worn. Any advice would be most welcome
Suspend your AMS from the top of the enclosure after putting it back together.
That's actually how I had it set up to start, zip-tied under a wire shelf. That configuration takes up a lot more room and leaves very little for filament storage, so that'll be my last resort if I can't figure out any other way
I'm guessing the angles are not playing nice with the mechanisms. It was designed down the the penny so there's probably not a lot of extra torque in the system to compensate for new angles and friction when you mess with the layout.