Four sided 70-80° overhang test with 30mm bridging.

I made this test to map the cooling performance of my Cobra cooler ( http://www.thingiverse.com/thing:1090433 ). It tests the ability to cool overhangs from four sides. It also has a sensible 30 mm square bridging test, which corresponds to the kind of bridging you might encounter on real prints. Optimizing your printer for 100+ mm bridging is silly in my opinion because it compromises performance in real life scenarios.