A 3D pen is a handheld device that heats and extrudes plastic filament, enabling users to draw freeform three-dimensional objects or repair existing 3D prints. Unlike traditional pens, a 3D pen uses thermoplastic materials such as PLA or ABS, which are melted and quickly solidify as they are released, allowing for the creation of physical structures in mid-air. While primarily used in art, design, and prototyping, 3D pens can also be found in educational settings for teaching concepts related to engineering and geometry. In cybersecurity, the relevance is minimal, but awareness is important as 3D pens could potentially be used to tamper with physical security devices or create unauthorized hardware modifications.