A basic introduction to Blender to help you learn how to make 3D objects for use in Android game development environments like Unity.

Or, using these models and sending them over to a 3D printer straight from Blender itself. Not bad for free software!

ShareTextures allows you to download 3D models and textures for free with no limit on the number of copies, and all materials are CC0 licensed, so you can use them freely.