About this 3D model

I loved the design and concept of the original hex tile gaming set (http://www.thingiverse.com/thing:548), but when I tried to use the file the shells were all inverted and it appeared to be unprintable (the wall sections are fine though) So using the original thing as a guide I recreated the design from scratch, I've only test-printed one set so far, but I'm very pleased with how it came out!