1. Clean the teflon tube #
If both of these methods didn’t work you might also want to check if there are any impurities in the teflon tube. First, remove the nozzle and then pull filament trough the teflon tube a couple of times.
2. Clean the hotend pipe #
The last option is to also clean the hotend pipe. For this you need to remove the teflon tube and pull it trough the hotend pipe a couple times.