Honestly, this is all trial and error for this project. Basically I come up with an idea and work on it within Shapr3D until it looks the way I want it too. Then I use Shapr3D to manipulate the views and movements to see if all will work as expected. When I believe it is close I then export it as a High Quality STL and print it with my Makerbot Repliactor +.
Once it is printed I then test fit the parts, this is where I decide if something will work or if I need to modify it. If you followed my Hexabot Project (Hexabot project) you will see that I had many revisions of parts after test printing them and realizing that modifications are needed for practical use. This is the same with this Ferris Wheel. Many of the parts have at least 4 revisions for strength purposes as well as limiting the amount of parts for assembly.
Hopefully this helps some, if not let me know and I will try to explain differently.