Under-cabinet Modular Cutting Board Rack

Cutting boards take up too much space on the countertop. Simply store them under the cupboards using this simple, modular, bolt-on rack. The storage height can easily be adjusted in increments of 1 cm using interconnecting expansion modules to accommodate more or less cutting boards. As a bonus, creating a tall space and fitting just one cutting board creates a useful shelf to store knives or other utensils you may have sitting on your countertop. The entire system can be 3-D printed, except for