Three dimensional(3D) printers in the form of a 3D printing pen

3D printers [ ; Engraving machines; Flexographic printing machines; Industrial machine presses; Industrial printing machines; Machine parts, namely, roller bearings; Printing machines; Printing machines for web products, particularly wallpaper, floor coverings and films, parts for the aforementioned machines and lines composed thereof, namely, gravure printing lines, screen printing lines, flexo printing lines and combinations of the aforementioned lines; Roller chains being parts of machines ]