Extrusion Printing Tutorials from the Badship Marketplace. Be prepared to learn about the most common and probably the simplest form of 3D printing, the extrusion technique. In the Extrusion Printing Tutorials there is information about this additive technology is commonly used for modelling, prototyping, and production applications. The main printing material for Extrusion printing is a plastic filament. This filament is heated, melting in the printing head of the 3D printer. This is then extruded through the heated head and laid down in layers creating your 3D model print. The head receiving filament from a wound coil of media located on the 3D printer. With 3D Printing Tutorials you will learn the basics to mastering the art of 3D printing.