Autonoumous Lego Car

Hi there,
here I designed an autonoumous car for lego. It´s all in one brick and you can print it without support. Things requiered and to keep in mind for building:
- arduino nano
- motor driver board l298n
- battery holder
- two servos (prepare for simple motor run be removing the plastic stop bit by the gears and connect two wires directly to the motor
- switch with 9mm diameter
- ultrasonic module HC-SR04

HELP NEEDED:
I forgot the coding ;-)
If you accidently find it on the web,