I made a boat in SketchUp and I need to 3D print it a class. I converted it to an STL with the program extension for it and I opened the STL in the MakerBot software to load into a 3D printer. It looks fine but shows some of the walls invisible when I move it around and when I do the verify task to show me the steps in printing it makes the entire body of the boat solid and closes the top but the STL in Windows 10 3D builder shows the boat with an open hull like in Sketchup. I have 3D walls, not paper thin, and the bottom of the hull is also not paper thin. I am new to Sketchup and 3D printing and Makerbot. The boat is supposed to have a hull like a little paper boat but the walls are thick. I uploaded the file if anyone can look at it. Also, there are two holes and I need them there to hold straws for a mini engine.
Here is the model in the Makerbot software after being converted to an STL:
As you can see, the entire body is filled. If you check it in Sketchup, the hull is depressed inward and not a complete solid. I can only upload one image so I can not compare both.
Boat.skp (146.2 KB)