It´s a little box to make unused space accessible.

espacially for Pinhole Patterns of Ikea-Method kitchen funiture.

Note:

I increased the Vertical shell Perimeters to 5, to avoid infill in the Walls.

To make everything look smooth, I recommend these Pinhole Plugs
(https://www.printables.com/model/161284-ikea-furniture-pinhole-plug)
to cover the remaining Pinholes.