A 3D printer is a machine that builds physical objects layer by layer from digital instructions, usually in the form of a model file and printer commands such as G-code. In security work, 3D printers matter because they are often computers as well as machines: many have firmware, web interfaces, storage media, Wi-Fi, USB ports, or cloud links. That makes them part of the attack surface in maker spaces, labs, and factories.
Attackers can abuse a 3D printer by sending harmful job files, changing print settings, replacing firmware, or using an exposed management interface to reach other systems on the same network. Defenders reduce risk by isolating printers on separate networks, disabling unneeded remote access, keeping firmware updated, and checking print files before execution. In industrial settings, secure printers also help protect design files and prevent sabotaged parts from being produced.