Make sure the fan is on and make sure it is taking at least 5 seconds per layer. If you don't do both of those then you will get exactly what you see here (although I think illuminarti is right and it's printing over air). For example the "minimal layer time" should be at 7 seconds and more importantly, "minimum speed" should be 0 (under expert/cool).
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illuminarti 18
What temp and speed are you printing at?
What program are you slicing it with? I recommend using the latest Cura. I get pretty good results printing hollow models like these, even with zero infill, although I haven't tried this one (yet).
That said, the top of objects like this is always going to be tough, because there's a very gentle slope, so you can easily end up printing over the top of nothing. You need to make sure that there is good overlap between the layers. Going to a thinner layer height might help (I like 0.06 for these sorts of things) ... or adding a third loop (going to 1.2mm shell thickness).
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