A 3d printer produces parts a layer at a time. FDM (Fused Deposition Modeling) printers work by heating a filament, often a type of plastic, to the point where it is soft enough for extrusion through a nozzle.
I'm Irv Shapiro AKA Dr. Vax. I am not an MD or PHP. Over thirty years ago while working at Digital Equipment Corporation (DEC) and specializing in VAX (virtual address extended) computers, an early adopter of virtual memory, I acquired the nickname of Dr. VAX.