MT220 foldable 220 fpv quadcopter

UPDATE 2015-05-15: PDB Base. The two files for the lower (BL_PDB) and upper (BU_PDB) base parts offer the ability to mount a pdb (abusemark or one with integrated step-down-converters) and the FC or even an OSDOGE sandwich-style for some extra neatness. v3 offers a few minor improvements.

UPDATE 2015-07-18: arm V3: minor changes, mainly for 220X motors

The MT220 quadcopter frame is a very small and sturdy frame for a full size 250 setup.
To my knowledge it is the smallest folding H-fra