I used blender for the exporting and it was really nice to use with all the options ready. I choose a simple rock i found oustide for my object and it had to do a little editing in the blender to correctly get the rock in similiar shapes! Enjoy My Work!
Here is the added image i forgot to add previously. When i printed the stone it took about 3 hours and i used some support strings in the print to help it be stable. I lost a lot of detail in the process of ripping off the filament but it came out pretty well!