Your suppose to stay up all night and watch it print.... Lol. What could of happened? How do you have your spool sitting? Mine didn't come with a spool holder so at first I set my filament on the table next to it.... But I found that the filament would tangle and occasionally it seemed like RoBo strained to pull it... So I used a camera tripod And used the arm on the tripod to put the spool which solved the issue. Is it possible you filament bonded or tangled up overnight?