Tried different master spool on MakerWorld, but none of them fit the bet of my A1 Mini. This one can be printed on the A1 and still fit a large refill spool filament ( 1kg) from BambuLab or Amazon .

Fit 83mm-85mm refill filament spools from BambuLab ( internal diameter is 83mm)

WARNING : I didn't test with SUNLU 1.75 , 1kg, 87mm refill but it may work aswell.

How to use :

1) Print both parts

2) insert the refill ( with the plastic retainers)

3) Connect the two parts and slide them until they click

4) Once its secured and only if you feel them stable, cut the plastic retainers of the refill

5) connect the spool to the AMS lite