PrintBot Beetle

The PrintBot Beetle is an educational robot that can follow lines, search for light, and grab objects with its claw.
You can see it in action at http://youtu.be/cYbD-ICMmU8
The robot has been designed to attach other components such as servos, LEDs, push buttons, a buzzer, and other sensors included in the product "Zum Box" distributed by BQ.

BOM
Printed parts:
You will need to print one copy of each part, except for the following:
4 x screw_cover
2 x wheel_front
2 x wheel_rear

Hardware:
7 x M3x10 screw
1 x M3x12 screw
8 x M3x16 screw
2 x M3x25 screw
2 x M3x35 screw
14 x M3 nut
3 x M3 blocking nut
4 x 3x84mm O-ring
8 x AAA batteries

Parts included in "Zum Box" by BQ:
1 x Battery holder
1 x BQ Zum Core
2 x IR sensor
2 x Led
2 x Miniservo
2 x Continuous rotation servos

Build Instructions
See the attached pdf (in Spanish) in the "Files" section. Pictures are clear enough to follow the steps even if you do not understand Spanish.

Example code
Attached