Here's what you do. After you have created a model in LeoCad (you can also create one in MLcad, but either one works. I use LeoCad), you need to export it as a Wavefront file. You can do this by just going into    file>export>wavefront  . Export your model to wherever you want it in your documents or something. Then open up blender. After openning up blender, go into    file>import>wavefront(obj.)    . After you click that, a gray screen should show. Just browse into wherever you exported your model as a wavefront to, and then click it. Then click import. A small box comes up after that. It's basically just a settings box for the model. Don't worry about it. Just press ok. You should now have your model imported on the main blender screen. On the bottom box/section, there should be basically be a bunch of different buttons, just as before. At the very top left of that rectangular box at the bottom of your screen, the should be a small little white box with to gray rectangles in it. Click it, and then select timeline. The timeline should replace all of those setting buttons. You should have a small green line at the beginning of your timeline on frame one. Move, rotate, scale, or whatever you want by clicking spacebar, then going to transform. Then click the letter i on your keyboard to create the keyframe. Continue to do this until your animation is completed. Then simply export it.