This is a set of adapters to fit three shallow IKEA Trofast boxes into one IKEA Kallax cube. I use 3.5x16mm torx screws to fasten the adapter to the cube. As the furniture is basically made of cardboard, I wanted a design that supoorts itself. The screws are only necessary so the adapters don't fall over. You have to print two (2) sets of left and right for each box, meaning six sets or twelve objects for a full cube.