So I’m trying to print this box, however when I print it there are triangles on the top layers that I just don’t want to see, and I have no idea how to fix it.
@wirlybird hit it on the head. Its due to slopes. You can get less stepping by lowering the layer height, for example from .3 to .1.
In Simplify3d, you could run different processes, so you could print up to that area in a larger layer height, and then just do that area in a lower layer height.
That’s the stepping of the layers. If this is your model make sure the top surface is flat. You can try to orient this as flat as possible but the surface is convex not flat.