There are so many types of 3D printing these days in support of all aspects of industry it boggles the mind. I have a small 3D printer and I really need to get off my hands and learn to use it and some CAD.packages I have. I think I'm leery that I might not have the patience!
Different types of printing is described well here: https://all3dp.com/1/types-of-3d-printers-3d-printing-technology/
I was fascinated by the 3D sand printing: revolutionary for foundry work...
Jerry