I use a Harbor Freight Mini Toolbox to store tools and extra parts for my Bambo printer.  I was needing some additional storage, so I decided to design some simple drawers to fit below the toolbox.  Printing two of the cabinets and connecting them side by side gives you four addional drawers for storage.  The two cabinets can be connected together with 8mmx2mm round magnets or you and can use the pins that are provided in the design.  I also designed an adapter that can be attached to the top of the cabinets that fit within the bottom of the mini toolbox to help keep things in place.  Print two of the adapters and align the arrows so they point to each other.  Use the pictures to help with proper orentation for the adapters.  Additional cabinets can be stacked to give even more storage.  

Update:  Added option for larger bins.