7 3D printing pens; three-dimensional printers, namely, electric plastic extrusion instruments for creating objects via melting, cooling, solidifying and extruding plastic; three-dimensional printers, namely, electric extrusion instruments for creating objects via melting, cooling, solidifying and extruding edible substances; holders for three-dimensional printers, namely, stands for holding 3D printing pens; specially fitted platforms for three-dimensional printers; Fans, unblocking rods, wrenches, and warming wands for creating objects via warming of plastic materials, sold as an integral component of 3D printing pens; Soldering hobby craft kits comprised primarily of 3D printing pens and electric soldering irons; hobby craft robotics activity kits comprised of 3D printing pens and robotic parts to be assembled with the 3D printing pen; Non-adhesive gridded plastic platform specially fitted for use with 3D printers for constructing 3D objects