Part II (Chapters 4–6) review how to decide what kind of printer you need to buy, based on what you want to build with it and what materials you think you will want to be able to use. This part also reviews what kinds of facilities different 3D printers require and offers hands-on details of dealing with issues that might arise during a print. Finally, this part reviews options that you can use to create 3D-printable model files.