About this 3D model

This is just another example I want to use for the students. I created the design from scratch in SketchUp. For some reason, the other bridge printed perfectly fine with the beams running through the middle and on top. For this, I had to create a base under the truss and beams overlapping the very top of the truss for it to work. I have no idea why it was doing this, but it ended up working out. This is still a work in progress, but I wanted to iron out all of the kinks before I let my students go at it.