Here's a snap-fit adapter for prusament spools that negates the ‘notch’ of the inner diameter. It also reduces the inner diameter of the spool to ~ 45.8mm
Recommend printing .2mm with 3 perimeters and 15-20% infill (it will be mostly solid anyways).
Also added one with 40mm diameter.
PETG is recommended, but PLA also works.
The author marked this model as their own original creation.