Mendel Frame Vertex - Aced

An optimized key component for RepRap Mendel - the frame corner bracket. This version is less prone to warping, easier to print, uses minimal material while providing excellent mechanical properties. This final version comes after several weeks of testing various different designs, although there are two key designs for comparison:

[A] 'Low warp, shelled Frame-Vertex' by MarcusWolschon
http://www.thingiverse.com/thing:2413 (frame-vertex 6off.stl)
+ Elegant design, uses compliance to minim