Sunlu filament rolls have a large 73 mm hole in the center. This is too large for it to fit on to the Bambu Lab A1 AMS LT system. So I made this adapter to allow it to fit. It requires a M3x8 bolt that's threaded on to a small hole on the side. This bolt extends into a hole on the filament roll. Make sure the flange with bolt is on the outside of the holder. Push it up against the back of the holder so it contacts the rubber holders.

The bolt will keep the roll from spinning and will hold it so it will retract. It is short enough as to not interfere with the filament. It's simple and it works.