Error on importing some meshes to gazebo

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Well guys, i'm using a 3D modeled Hexapod robot that was make on Solid Workd. Well, I'm trying to import that robot to the gazebo simulator. I worked with other simulator, the Morse, then I needed to export my robot to Blender and save in blender format. I saw that gazebo uses a .dae and .stl files to atach like meshes, but i was trying tu use blender to create that meshes and it was not effective. I was receiving some error with the file created when tried to test. So, could you tell me one easy way to open that robot on Gazebo, or some usefull tutorials? I followed all tutorials using mesh from gazebo, but when i tried to do it myself, got some errors.