3D printers; 3D printing pens; Electronically and power-operated tools, namely, pullers and components therefor, nut splitters, extractors, separators, spanners and coil spring compressors; Hot melt glue guns; Laser engraving machines; Machine parts that heat and maintain temperature in machine piping systems, namely, steam jacketing, electrical tracing, and insulation sold as integral components of finished machines; Print heads for 3D printers; Printheads for 3D printers; Thermostatic contr...