3D pens being 3d printers; 3D printer in the nature of object drawing pen; 3D printer pens sold together as a unit with 3D pen filament refills; 3D pen accessories, namely, replacement nozzle, sample plastic filaments, power adapter, all specially adapted for use with 3D printer pens; 3D printer in the form of a pen that draws 3D objects through plastic 3D printer filaments; pen in the nature of a 3D printer for drawing three dimensional objects by means of plastic filaments; 3D printer, name...