3D printing is an additive production technique developed for rapid prototyping. Its goal is to quickly and easily generate a physical piece.
Different materials can be used, more generally ABS plastic, PLA plastic, and metal, but also wax, or even plaster.
The applications of 3D printing are varied, but in all cases aim to concrete visualization of projects, or verification of parts ergonomics.
3D printing works on the principle of a heating nozzle, guided on 3 axes in relation to the part, which mechanically heats and deposits a plastic wire (ABS or PLA are the most used) in successive layers on a tray.
The CAD model is cut into 2D layers before printing.