This is a Excellent Video Training on Learning Autodesk 123D Design
In this Learning Autodesk 123D Design training course these videos will teach you how to create simple, useful items suitable for 3D printing. This course is designed for the absolute beginner, meaning no experience with Autodesk 123D Design is required.
You will start by learning about the interface, then jump into learning about basic tools and techniques, including mirror, offset, scale, split solid, chamfer, and non-uniform scale. From there, These videos will teach you advanced tools and techniques such as sketch fillet, combine/merge, loft, and sweep. Finally, this video tutorial will teach you how to 3D print the model.
Once you have completed this computer based training course, you will be fully capable of creating and editing your own models that will be suitable for 3D printing.