The pen with Multicolor Filament is in perfect use in time. With the pen in possession the kids are on their way in planning and constructing the various 3D creations. The Rainbow Filament is highly innovative and colorful. It is a way to inspire the young artist with an innovative tool that can go beyond the traditional mode of drawing. Here is the most innovative item called the Rainbow PLA. The 3D Pen Filament is just great for kids. This pen has become extremely popular among drawing tools and it unfolds like a game changer to help transform the drawings into tangible and three-dimensional characters. The 3D pen will allow you to draw things on surfaces and even on air.