Splitting terrain

Hi there! I have a model wanting to export for 3d printing however to do this I need to cut a spliced terrains sections where they connect to the large terrain model. Does anyone know how to do this please?

cluster a5 v3.skp (296.0 KB)

If you want to 3D print, the model must be a solid, you can use the native Boolean tools from skp or plug-ins like bool-tools, you can also create a plane and intersect faces with the terrain and get rid of the parts you don’t need.