When you're out of good parts, you might need to improvise. Bluetooth robot with two DC motors and an office chair wheel mounted on a...

Download the plans here: https://www.thingiverse.com/thing:2756604 Cheap to build (if you have access to a laser cutter) and fun to...

My plans, which are remixed from an Arduino container by Zygmunt W., are available here: https://www.thingiverse.com/thing:2802290 Build...