A filament reel holder, which is made up of two components fixed by screws and can be flexibly adjusted to fit filament reels of different widths. There is nothing special about its design. Just put three sets of such holders side by side in a cheap transparent plastic storage box sold in local hardware stores, and then add three filament funnels, a suitable amount of Buden tubes for each, and Buden tube clips placed on the outside of the box. A simple filament distribution box is ready...

Updated on August 23, 2019: A new improved version has been added, featuring an extended cylindrical design that is compatible with wider filament reels.