my Extruder will not push out filiament

i just bought a tevo tornado printer, i set it up and it ran like a charm at first, But after the second print my extruder will only print the thinnest layers you can imagine and then prints in the air.


I checked my code, the layer hight did not change.

i checked the motor that feeds filament into the hot end. works fine.

I took the hot end apart and clean out the filament, i could almost breath through it.
when i push the filament back in and push it in manaullyit comes out just fine.

only when i print do i run into this issue.