ChromoFilament

ChromoFilament is a specialized thermochromic 3D filament designed to visualize the invisible malleable states of extruded materials, particularly within the context of 3D pen-based crafting and fabrication. In manual fabrication processes, users often struggle to identify the optimal temperature for deformation, which can lead to fabrication failures, structural collapse, or accidental burns. To address this, ChromoFilament utilizes customized thermochromic inks that shift between three distinct colors to signify specific physical states: a transparent hot state (above 60C) alerting users to stickiness and burn risks, a light green malleable state (40C to 60C) indicating an ideal window for hands-on modification, and a dark blue solid state (below 40C) confirming structural stability. The filament is produced through a DIY-scale manufacturing process involving the coating of PCL pellets with designed pigments before extrusion. Beyond immediate visual guidance, ChromoFilament enables users to manage their 'working time' effectively and plan complex fabrication sequences, such as selectively heating local parts while maintaining the integrity of adjacent structures. This material-oriented approach provides a safety-conscious and intuitive workflow for creative thermoforming and digital fabrication.