This semester I decided to swap activities, and instead start with the 3D model so that students could first get an understanding of what the ScribbleBot does without having to focus much on the build process. For the second activity, they built their own from recycled parts. Having the background of how the circuit worked, they could spend their time on the actual creation of the bot. In addition, to help ease the process of connecting motor leads to the battery, I sought the help of a local bike shop that donated used tire inner tubes. Cutting these down in thin slices provides the perfect wrap for a battery so that wire leads can more easily slip into each end. See photos below.