A snap-fit is a mechanical joining method that uses flexible tabs, clips, or latches to lock two parts together without screws or glue. The parts bend slightly during assembly, then spring back to hold the connection. It is common in plastic housings, battery doors, device enclosures, and 3D-printed prototypes because it is fast to assemble and easy to manufacture.
In cyber security, snap-fits matter because many real-world attacks begin with physical access. A snapped-together case can often be pried open with simple tools, exposing ports, buttons, storage, or debug interfaces on routers, printers, IoT devices, and other hardware. Defenders use snap-fits for convenience, but they must balance that with tamper resistance, serviceability, and material strength. In printed parts, brittle plastics can fail at the clip, while tougher materials hold up better under repeated flexing. A good snap-fit works when the latch is strong enough for daily use, but not so weak that an attacker can open it easily.