This is a derivative of the collegeBot that was modified to use a dual motor gearbox, a speaker with a larger magnet, a push button with a larger diameter and slightly smaller slide switch. The changes only required some minor modifications to the openscad files. Thanks to the collegebot creator for publishing scad files and not just the stls! The side panels and the head remain unchanged from the original collegebot. The major change to the design was that the bot had to be made narrower due to the fact that the two gearboxes can't be mounted separately. Thus the top, speaker shelf and bottom plate had to made narrower. The bottom plate was also changed into a single piece since it would fit my build area. These are the revised parts: Gearbox: http://www.pololu.com/product/61 Pushbutton: http://www.amazon.com/gp/product/B00D7C443C Speaker: http://www.amazon.com/gp/product/B008999NS Slideswitch: http://www.amazon.com/gp/product/B007Q9YCAC I also am using a full size arduino instead of a nano and mounting it on the bottom. Note: the build is not fully complete at this point. The printed parts all seem to work. Just the wiring remains to be done. Also haven't decided on exact battery arrangement to use, but leaning towards a 6 AA battery arrangement to supply both the arduino and the motor supply, tapping for the lower motor voltage.