I think everyone thinks of Quadcopter as a real fun to try. In fact they are fun to fly, but even more to make one. Florian shares his second upgraded version (se the previous here) of quadcopter which has more power from all points of view. First of all it comes with higher thrust brushless motors, next thing is larger battery. And probably biggest step up is microcontroller. If in previous there were Atmega32L, now it has ARM Cortex M4 (STM32F405RG).
With bigger processing power there are more possibilities to do. The frame is 3D printed with all convenient clips and fixings. This looks really impressive comparing with its predecessor.