https://www.skillshare.com/classes/How-to-Design-and-3d-Print-in-Blender/643208752

In this class I teach you exactly how to design stuff in Blender specifically for 3d printing. We'll be going over basic commands and functions for creating something we can 3d print. 

In this class we'll be designing Luke Skywalker's lightsaber

At the end of this course, you'll be able to design and 3d print Luke's lightsaber from scratch.