The Ultimaker cleaning filament is the most effective way to unclog and keep print cores in optimal condition. It is for both print core maintenance and unclogging procedures. It is recommended performing regular maintenance once every three months. Unclog the print core if there is no material extruding from the nozzle for at least ten minutes. It can be used to clean the Ultimaker S5, Ultimaker S3 and Ultimaker 3 print core