Filament Efficient Folder Holder (requires cardboard)

A teacher in our school had a storage cabinet that was used to hold folders, but the width was too thin to fit even a simple manila folder. From this point on, my engineering class became a makeshift IKEA, and stayed this way pretty much all year. This storage solution is designed to use a reasonable amount of filament without losing structural integrity. We accomplished that feat by stealing all the cardboard boxes from the copier rooms. We cut and super glued the cardboard onto a frame in each