Kopija od Optimization - Box
The sliders on the figure of upper-left of the worksheet allow you to set the size of the cardboard. The 'c' slider allows you to adjust the cut-size of each square.
As you make these adjustments the box is shown.
The plot on the upper-right portion of the worksheet shows volume as a function of cut size. You can show a single value or many values using the toggles below the graph.