This is a parametric spool roller core designed in Fusion 360(files provided). It uses two 608 bearings and four m3 screws to provide an adaptable spool roller.
I find myself using a lot of Filament from the same provider(3DSolutech) and figured that it'd be nice to have a core that fits the spools nicely but can also be adjusted to fit other spools easily!
This model can be adjusted to fit spool cores down to 41mm and up to 100mm+. This can also be adjusted to fit spools of a different width. The model can be adjusted down to around 25-30mm without issue and up as far as you'd like. The design also gives you about 12mm of width flexibility after it's been printed(seen in pictures). It was designed using Fusion360 parameters so the only adjustment that needs to be made is to the 'SpoolCenterHole' or 'CoreWidth'(shown in red above) according to your needs.
This was designed to be used with my filament dry box found here: https://www.thingiverse.com/thing:3230377