Hi, Unfortunately I do not see the walls in stl files

The only item that I had a problem with was the staircase. It is too large as is, for my printer to print in a 1:12 scale. If you had made it in two sections , I could have manipulated it to work without trying to reedit it in another app. The other items came out great looking and were easy to manipulate to the scale I was working with.

Good, however, I'm new to 3d printing and since I have a small printer bed, I will have to figure out how to print them separately and resize.