My Gooood! How to avoid failure printing due to cross tangle 3D filament?

[William.T]

I bought a 3D printer and learned a lot in the past 3 months. It is really a good thing that I can make some fun models and share with my friends. But sometimes I can not print the model successfully.
Yesterday I wanted to print an owl to my niece Joyce. It had printed for about 7 hours with smooth surface, then the printer head was moving with no filament coming out. The filament jammed on the spool due to cross tangle. What a nightmare! 7 hours for nothing! I confronted this issue last month but I thought it was a random issue. So I didn’t care that much. But now this happens again. Does anybody can help me to solve this issue?