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i re-downloaded & disabled support - same error. I loaded the gcode in gcode.ws and see the error there too - right at layer 844 @ 15.21mm Z - it just starts printing inside the hexagon with nothing underneath it (not at all blaming this STL - its gotta be something i'm doing wrong or some evil setting i have). In Cura layer view, I can see how the hexagon base is separated from the inside cylinder -- http://i.imgur.com/NLEXrlG.png