Reduction for a spool with a larger opening of 75 mm (flexible arms) to 44 mm.

It significantly reduces the resistance to unwinding the filament from the arm.

Optimized filament consumption.

You need to print 2 (on both sides of the spool) or print 1 and rescale the width to fit your spool.

No supports needed. Filling 15%. PLA material. I recommend brim.