17 Plastic filaments for use in 3D printing, including, plastic in the form of filaments for further manufacture using three-dimensional printers; materials used to create three-dimensional designs and objects, including, semi-worked thermoplastic filaments used for 3D printing; industrial 3D printing kits comprising molds and stencils to be used in connection with modeling compounds used for 3D printing; semi-processed plastic in the form of films, sheets, tubes, bars, rods, ribbons, strips and pellets for creating three-dimensional artwork, toys and playthings, scale model buildings and items in the nature of functional items and design items; plastics in extruded form used to make three-dimensional artwork; extruded plastic in the form of feedstock, sheets, rods, pellets, and sticks used to make three-dimensional artwork; holders for three-dimensional printers