Silicone Nozzle Seal/Cover

The dual-extrusion Ultimaker 3D printers, the Ultimaker S5, and Ultimaker S3, utilize silicone nozzle seal or cover across the bottom of the tool head which protects the articulating hotends, helps keep hotend temperatures stable, and covers the bottom from filament backflow. Over time, the silicone nozzle cover on your 3D printer will undergo normal wear and need to be replaced. This is an important regular maintenance task that will protect your Ultimaker 3D printer.