If you're interested in creating your own 3D models for Source Filmmaker (SFM), there are a few key steps to keep in mind. First, you'll need to choose a software program for creating 3D models, such as Blender or Maya. Once you have your software, you can start creating your model by sculpting its shape, adding textures, and rigging it for animation. After that, you can import your model into SFM and start animating. With practice and patience, you'll be able to create your own custom 3D models for SFM!