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The filament is wound like a thread on a spool (or bobbin) and loosened a little and moved to the extruder for filament extrusion. When the filament is wound on the spool, it is wound with a certain strength so that it does not loosen. When unwinding to use the filament fixed to the spool, the wound filament is easily loosened by resilience. The filament got in a tangled at that time

It is not easy to find the place to get tangled and it stops forwarding the string of filament to the extruder when the filament got tangled. To prevent this problem, grab the end of filament or fasten the filament with the spool to avoid loosening up

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