I made a 'TEST YOUR 3D PRINTER! V2' with overhang curling up test

This is an unofficial and against the license remix (I'll take it down as needed) of the awesome 'Test your 3D printer! v2' (Test_your_3D_printer_v2_0.48mm-with-overhang-curling-up-test.stl) http://www.thingiverse.com/thing:1019228 model as the option to 'Remix It' is disabled and the 'I Made One' does not allow uploading models.

My Printrbot Metal Simple (second-hang and my first 3D printer) would pass the test yet relatively simple prints would fail due to over-hangs curling up - so I have