Silicone Cover for your Ultimaker 3 and Ultimaker 3 Extended Print Head.
The silicone cover shields the print cores from cold airflow from the fans, which helps the print cores to maintain a stable temperature while printing. The cover also helps to prevent backflow of material into the print head when something goes wrong during printing.
The silicone cover may wear over time due to the heat of the nozzles. It is recommended to check the quality of the cover at least once every three months.
Checking the Quality of the silicon cover- Instructions
How to replace the Silicone Cover- Instructions