A stackable modular spice rack. This design uses dove tail joints that act as connectors to allow multiple sections to be connected making an expandable spice rack. The dove tails also double as feet to provide a flat surface on the bottom for the spice rack to stand on.
Some people have told me they had trouble getting two sections to slide together. I added fillets to the dove tails to make them easier to slide into their joint. Use the filleted STL if you think you might have trouble getting multiple sections together.