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Check out http://www.thingiverse.com/thing:42633 for an idea on the arms, those are very rigid loadwise, but a little twisty - did not cause any problems for my KK. (arctic tern quadcopter) also, who'd of thought, I'm in Fairbanks too... perhaps the printable quad community should get together and chat sometime! We're working on a drone for forestry...

Arctic Tern Quadrotor