Test Paperbox.

I want to make a box that looks like a paperbag.  I designed in Blender a simple box.

It was created out off a cube without the topface.  I added a solidify modifier and made a thin innerwall of 1 mm. 
In Cura I  kept the settings for the previous box.

The print started ok.  A nice bottomlayer and the walls looked good. The inner and outerwall were connected because there was no space between them. That is why I could keep the Fill Density 0%.
But after about 1:40 hours there was an under extrusion allthough the feeder gave no problem. The filament wasn't grinded.   I had to stop the print...