[Cura doesn't slice properly]

Congratulations!!  What is the box for?

 

It's for electronics - power supply, and usb relay board (http://img.dxcdn.com/productimages/sku_308292_2.jpg). Whole project will be used to control BMX Start gate.

[Cura doesn't slice properly]

Thanks for your advices! I've added thickness to the walls in Sketchup and it helped.

My first 3D print is done!

 

[Cura doesn't slice properly]

I have a project of simple box created in Sketchup, however Cura doesn't slice it as I want. It's my first try of 3d printing and I have completely no idea what am I doing wrong.

Sketchup:

Solid:

X-ray:

On x-ray view there are missing one corner (left top) and these 4 stacks inside the box. Also walls are empty in the middle.

Whats wrong?

Here are my sketchup and stl files:

https://www.dropbox.com/s/apawsprtyntdx9m/box2.skp?dl=0

https://www.dropbox.com/s/6vtlj0ezetoq5bf/box2.stl?dl=0