Hey guys,

This is my first post so sorry if it's in the wrong section. I am trying to create a portable Raspberry Pi as part of my senior project in college and am taking a stab at 3D printing a case for it. I designed a case in Google SketchUp and exported it as a .stl file. I do not personally have a 3D printer but our IT department on campus does. I submitted the design to them so they could try printing it and apparently all the sections that are supposed to be hollow are printing as a solid block. I was also told that the design takes a very long time to compile. I believe they are using a MakerBot printer but I don't know the specific model. I'll post my designs below (both the SketchUp file and .stl) and hopefully someone can tell me what is wrong with them. This is my first attempt at designing something to be 3D printed so I'm not sure exactly what to look for. Any help would be greatly appreciated!

https://www.dropbox.com/s/eey3h9unm9...ablePiCase.zip