check the 'layer view' in Cura to see if there is anything suspicious in that section. It is possible that parts of your design are to thin to print and Cura has to skip that section.
If all the layers are there than you should look more into the hardware of the machine or material, like Stu said.
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stu_le_brew 42
difficult to diagnose this, were you watching it all the time ?
if the print head gets blocked the printer does not know this and will just carry on printing, so if you missed the moment when it stopped it will just look like it s printing in the air above the print.
I would recommend you check the feeder (at the back) and try a "atomic clean" (http://support.3dverkstan.se/article/10-the) of the print head
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