Malfunction K8800

My Vertex Delta printer always unloads the filament…after loadingit new it doesnt extrude more.
The filament is okay with 1.75mm so i dont know the problem.
Every time i print something it unloads it 2 ore 3 times a row…
It sucks…
And sometimes even it doesnt unload the filament it doesnt extrude any filament

Thanks for your help

Have you tried to unplug the filament run out sensor? The sensor sometimes false detects a runout which leads to unload the filament. Unplugging it fixes the issue.

Indeed that’s propably an issue with the runout sensor.
Please try unplugging it.