all the source code for the class is available here:
http://challenge-bot.com/repos/?p=challenge-bot;a=snapshot;h=232ff7a14f9d8be27362c268c6cdd1b67f59a24a;sf=tgz
+
+ what follows is a high level description of the contents of the most
+ important top level directories in the class content.
+*** 3d-printables
+ the parts of the robot that are 3d-printed are in this directory.
+ use openscad to open the parts in this directory.