Define the problem
Generating concepts
Spreadsheet
I did all the measurements with a dial caliper from rough side to rough side to get the width of the cube. We measured the cubes because we wanted them all to be about the same width or they wouldn't fit together.
We did isometric sketches of random pieces that we could use to make our cube. We did this to help speed up the building process by having 20 pieces already drawn for ideas.
Develop a solution
CONSTRUCT and test a Prototype
Degrees of freedom are the ways an object can rotate or move across the three axis. We had to restrict all degrees of freedom in order to complete the assembly. The reason for that being that if degrees of freedom exist that you don't want,it would compromise the integrity of the design.
Evaluate the solution
I wouldn't change the design because it isn't too hard and it isn't really easy either, so it would appeal to a larger market. If I had more time I would re-glue a couple of blocks because they aren't straight and that adds to the frustration.