This is the Spidex Micro quad copter design By Quaternium.es They decided to open its design to everybody, so you can print one if you want.I flies really well and can be printed on PLA. It is design for motors similar to multistar 1704-1900 and propellers of 5x3, on 3s batteries.You can find more info here: In English http://fpvlab.com/forums/showthread.php?23283-Spidex-MICRO-from-Quaternium-multicopters In Spanish http://www.multicopters.es/foro/vbulletin/showthread.php?3905-Spidex-micro&highlight=spidex+microVideo test by me here; https://vimeo.com/81756075