About this 3D model

My cat likes to sleep on top of the furniture, but getting there and back is a challenge for her. I designed this shelf so that she can use it as intermediate step to reach her sleeping place. Special care was taken to make it strong. I printed with ABS, but should be printable with any other material. Single color per tray. Very little support required for the base. I used heat-set inserts to assemble two parts. Alternative is to use screws or just glue them together.