[Single line print too small to load]

So i need to print a couple of lines in a structure like this:

The single lines should be a different .stl file I have been told. And I already have a geometry.

 

The problem comes when loading into Cura. Cura either says the file is too small. As i am printing the vertical lines in surface mode to make sure there is only one pass. 

This problem i have sort of fixed by making these bigger geometries. However now everytime cura tries to slice this a lot of beams fall away. This happens very irrigularly. 

 

I hope some of you guys can help.

 

These are the models if i can load them into cura. This still wont be seen in the slicing.