Problems printing PETG

Hello dear Makers i ran into a Problem printing PETG while the test print seems fine . I have nothing changed on my config since extruder seens calibrated. Z height should be ok due to the test Print. lowered the speed to 50 mm/s for the first Layer. My bed is relative flat on this part of the bed i use adaptive bed mesh. same filament (spectrum filament lime green) on my anycubic i3 mega s looks fine. but on the vcore 3.1 it won't print even at the same temperatures as on the i3. Please help !! if you need some additional info i will provide them.