Willa is a 3d printed car that runs on cheap electronics and is controlled through a cell phone.
You can find the 3d models here which should be good for printing on a regular fdm 3d printer with no supports.
The car's microcontroller program is rather simple and based on arduino for esp8266. The controller is a web application meant for a cell phone. The UI definitely needs some work.
The electronic components needed are quite cheap and easy to find.
This is a public personal project and it's not well documented. Feel free to file an issue if you need help making one yourself!
This is not in sync with the current code (pin selection).
Parts can be exported from onshape or you can find them already lined up for printing here