Ender 3 Filament Spool Holder with Shell widths of 2.0 inch, 2.6 inch and 3.1 inch.

thingiverse

Here is a version of an Ender 3 Spool holder that has Patio Door Bearing Wheels for easy spool rotation along with 3 different spool width shell sizes of 2.0 inch, 2.6 inch and 3.1 inch. The three distinct widths can be used with various spool sizes since the spools of filament that you order may have different diameters. These 3D printed parts were designed using the EMachineShop software in its freeware version.