X550 Quadcopter

**UPDATE 28.6.2016:**
- I've been busy last few months, hope to find time for this hobby and to finalize this project page
- Motor mount holes are rotated 90° in ARM_ALT.STL

##### X550 is a Work-In-Progress - here's my To-Do list:
- upload some video
- more details on wiring (requires adjusting some cable lengths i.e. soldering and crimping new connectors)
- APM:Copter-3.3 parameters I use with this setup

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**This is a remix from Brendan22's** T4 Quadcopter

Soon after building my Prusa i3, I started printing T4 parts but found problems especially with arms because of heavy ABS warping and deforming. I started designing arms with more bonding surface and that meant the body needed changes too. While waiting for all the electronics I decided to redesign the whole frame. First frame was asymmetrical like T4 but I found problems when tuning it to stable hover. So I moved to X-style frame. Later I learned that center of thrust (CoT) needs to be coincident (or close enough)