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Re:FPV Mini Quadcopter Racing Videos by bnzelener on Sunday October 26, 2014 @06:41PM (#8512795)
Got a confirmed answer - he uses aluminum.

And on 3D-printing, YES - this guy is making awesome progress: www.hovership.com. I have one of his MHQ V1 frames.

Re:FPV Mini Quadcopter Racing Videos by thisjepisje on Tuesday October 28, 2014 @06:37AM (#8520269)
That's great, thanks for confirming :)