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File size is related to the coarseness of the mesh, so unless it's a part without much detail, like a smooth sphere, file sizes will be bigger than most people are used to dealing with in many CAD programs. You can make the mesh coarser but at the cost of detail. Some software has limits on file sizes it can deal with, some don't. It also might be related to the amount of RAM you have. If you can convert the mesh to surfaces, the size will drop, but you might not be able to keep the detail you want.