I can not seem to make my building model a solid to be ready to 3D print

Technical Problems SketchUp
1

I have not been able to make my model into a solid form so that I can print. I was wondering if anyone would be able to look at my design and help me get it ready to 3d print.

2

Just upload the model and someone will fix it and explain what the problem was.

-Gully

3

You should just say MAKE SOLID !
I looked for about an hour for some gap or line in one of the 3d text letters…No luck!
I gave up and used SCAD.
J