The 3D drawing pen is a combination of brushes and 3D printing technology. The printing end technology of the 3D printer is integrated at the tip of the pen. The ink on the pen body becomes plastic filament, and the finished product is changed from 2D to 3D three-dimensional model. Users can draw various realistic models not only on paper, but even on any surface or space. The 3D printing painting pens on the market are mainly divided into three categories: high temperature, medium temperature and low temperature. Different categories try different printing filaments.