I made this to hold 2 x 4 together at the corners. To make a workshop shelf for my 3D printer. But can be used for more than just that. Can also be made into a corner piece for any project. Such as a work desk for the garage, shelving for the closest spaces, and other project inside and outside the house possibilities are endless. 

I would suggest always checking measurements before printing to verify it will fit the 2 x 4 planks you purchased. I hope you enjoy the design.