After breaking 4 frames in the span of 2-3 weeks I'm done. The frame just isn't that robust or not enough for the kind of beating I'm giving them. I have two quads using the frames -- an M4 based LB and a standard LadyBird v2. I do fly them both a lot. So now I'm on the hunt for something more robust that can use the LadyBird motors. I'm thinking of going with this...
http://www.thingiverse.com/thing:166786
or this...
http://www.thingiverse.com/thing:296143
Then having a company like Shapeways print a few out for me.
Any other ideas?