Makerbot 2 - Model splits horizontally.

[sv-ark]

Hey,

I am having problems with a model, which i printed using the makerbot 2. The model is almost divided into 2 parts, a horizontal line goes through the model and almost split the model i 2 parts. The 3d file from makerbot desktop looks fine without any form for errors. Can somebody explain why the makerbot does this?

The model is printed using the standard settings. The makerbot desktop estimated the print time to about 7 hours and 37mins, but the makerbot 2 printed it in about 5-6 hours..