Once you’ve sewn all your strips you can begin cutting your cube shapes from each set of colors.  Please note – my photos are shown left handed. 

Lets start with the dark strips.  You have to make an initial angle so the strips will all come out angled the same direction.  Place the 60 degree ruler downward with the 2.5 inch line along the bottom seam and cut as close to the left edge as possible but not going off the edge. (see bottom photo photo).

Now that you have an angle to work with carefully cut strips measuring 2.5 inches wide – you should be able to get 9 + cuts on each color. (See top photo)