This cradle positions the filament spool just slightly forward of the printer top rail and mounts with one M5x12mm BHCS and an M5 T-Nut. It lines up with my Filament Sensor Bracket https://www.printables.com/model/209898-ender-3-s1-filament-sensor-bracket.
The roller uses two 8x22x7mm bearings.
PLA, 0.2mm layer height, 20% Cubic infill.
The author marked this model as their own original creation.