https://www.udemy.com/course/design-for-3d-printing-blender/
An online video course that teaches you everything you need to know to design and 3d print practically anything.

What you’ll learn
Learn the skills you need to design your own models for 3d printing using Blender, a powerful 3d modeling software application that is free and open source.
Bring your ideas into the physical world by designing in Blender for 3d printing.
Render your designs using Blender’s advanced render engines to visualize your projects before you print.
Export your custom 3d models to Cura to prepare them for 3d printing.
Learn to design your own unique creations from the initial idea stage to a complete finished 3d model.