3D Printing Pen

A handheld device that extrudes a quick-cooling thermoplastic filament (commonly PLA, PCL, or ABS) through a heated nozzle, leaving raised, three-dimensional lines that solidify within seconds of being drawn. In accessibility contexts, 3D pens have become a cheap and widely accessible tool for producing tactile graphics and tangible sketches: they let blind and low-vision users, educators, and parents draw raised diagrams, maps, and illustrations on paper or canvas without specialised embossers or swell paper. Recent research (e.g., Zhang et al. 2026) pairs 3D-pen sketches with image-processing pipelines that clean the drawings and render them on refreshable tactile displays, supporting iterative tactile authoring.