Based on this product's specifications, here are some alternatives and similar models
3Dsimo thermochrome refill white G3D3017 — thermochromic filament insert for 3Dsimo pens
Summary description:
3Dsimo thermochrome refill (G3D3017) is a white thermochromic insert designed for use with compatible 3Dsimo drawing and crafting pens. It provides temperature-sensitive color change properties for decorative and functional effects in prototyping, crafts, and model detailing. Use it to add heat-reactive accents or indicators in projects that require visible color change with temperature.