Simple OpenSCAD file to create spool adapters that can be pushed or glued into a spool. Parameters are outerHole for the hole in the spool and innerHole for the desired inner hole. I use 32mm for innerHole so it fits on the manual spool holder of the A1 mini.

I added two files for a 54mm to 32mm adapter (SUNLU, for example) and 63mm to 32mm (Ziro). Print two of them, glue or press fit them into your spool, done.