Thank you but i have two more questions.
I can't get my collison mesh to work. I made a collsion named it collsion-1 clicked create bounds on the exporter then exported. it doesn't work.
Wait, what are you trying to make? Modeilling program-provided Collision meshes for the most part only work with vehicles.
Also, how do you scale it all to a single point?
Pick 2 vertexes that should be the same, select them, click on Scale and bring them very very close together until they're essentially the same point. You need to do this for each and every 2 vertexes that should be the same. You will probably need to scale them from the Front view first, then from another view to cover all 3 axises.
You also need to get rid of the un-used faces between the cracks. Just click on Select, go down the tab window and click on "Faces", then a little lower click on "Select by Vertex". Hold SHIFT and click on every vertex that lines up the cracks (the wire frame area around the crack should be red now, it's all selected). Now to unselect the faces on the outside that you obviously don't want deleted, still holding SHIFT use the Right mouse button this time to un-select the vertexes on the outside (thus un-selecting any faces adjacent to them). Once only the faces inside the cracks are selected, press DELETE and that problem is solved. If something went wrong, Undo with CTRL + Z.