These are official spare parts compatible with the UltiMaker S3.
Nozzle Seal x3 (S7/S5/S3)
$29.97
The silicone nozzle seal on the Ultimaker S7, Ultimaker S5, and Ultimaker S3 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...
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