HELP Why does model look like this?

I made a quick frame in blender easy shape squares on sides and cylinder on ends easy shape. I ve uploaded box shapes before to demo and they loaded fine. I know this shape is non manifold so why does it look like this?

copy and paste link to see it?


https://www.shapeways.com/model/66338/demo_small_frame.html

please help thanks

Is "available to all" unticked in the model page? I cant view the model