The silicone nozzle cover on the Ultimaker 3 and Ultimaker 3 Extended fits on the underside of the printhead to help keep the temperature stable and prevent back-flow of filament. Sold as a set of 3 pieces.
Official Ultimaker 3 part compatible with:
Ultimaker 3
Ultimaker 3 Extended
Note:There are two versions of the metal bracket for the Ultimaker 3 family of printers. These nozzle covers will fit the version with 2 square holes in the metal bracket.
This is the print head assembly for the Ultimaker 3 and Ultimaker 3 Extended. It includes all pictured parts here, including the printhead cable, fans, and nozzle seal. If you're looking for spare nozzle seals for this printhead, they are...