I printed this Hat.stl on my Printrbot without problem, but on my Rostock Max v2, it leaves 2 connecting pieces off the print. You can see the connecting parts when the model is dropped on the bed and they mysteriously disappear when viewed in preview and it prints without the connections. I think I'm missing something. Any suggestions are appreciated. The file is located here:
http://www.thingiverse.com/thing:536900/#files