Hi Gambo,Thanks for reply, i totally forgot. I'm using PLA and it indeed looks like that's the case.I've tried leveling the bed again and than downloaded and performed bed leveling test. Material doesn't seems to stick to the surface.However when i start normal print it looks better. I've ordered a glass bed and hope it will help things out.What bothers me more is nozzle hitting the print. I'm still fighting with that.