This Spool adaptor is for A1 mini combo.

If your filament spool has bigger middle hole size than Bambu Spool, it is not really fit with 3pcs of spool locking bar in AMS of A1 mini combo.

I found ,after fixing spool into AMS of A1 mini, that there is gap between AMS spool guide bar and wall in middle hole of filament spool.

It cause spool can shake and move during printing and maybe escape from AMS Spool slot.

Especially, Spool extrude gear of spool no. 1 and 4 are located outside of extruder gear position.

when those extruder gears pull filament to extruder when filament location is inside of filament spool, filament spool get force to move outside of AMS spool slot and it may cause spool can escape from AMS.

So, I designed AMS spool guide that you can lock filament spool to make firm fixing of filament spool in AMS slot.

Hope to enjoy your printing !