BlueDog V4: Unibody Quadcopter

Summary This is the version 4 of http://www.thingiverse.com/thing:973089. Some of the changes from previous version, after test flying: Increased inter-arm distance on each side to 120 MM from the center of motor shaft. Main plate is 50 MM shorter at 150 MM Arms are thinner now, for a better air flow Arms and Main Plate can be printed separately and glued together.