The file 'Bearing Flange For SUNLU Spool Holder 3D Printer Model' is (stl) file type, size is 9.5KB.
I have a SUNLU spool holder with four pulley type wheels and have come across an issue where the reels fall off the holder when the filament angle changes - this is more likely with a reel with only a small amount of filament left on it.
I extended the depth of the pulley wheels by a couple on millimeters using these plastic flanges glued to the wheels
bearing_flange.stl | 50.1KB |