Hello everyone. I recently finished my mini kossel build and i am struggling with extruder/hotend now. I use airtrippers v3 extruder with MK7 gear from repraworld.com. The problem i am facing is filament slipping/grinding, when it reaches the hotend. It seems, that filament is stuck somehwere in the hotend and it creates a jam, causing filament slipping. Any ideas, how to solve this issue? I am using 0.25mm nozzle.