Has Snapmaker U1 clog detector?

has it? no filament sensor, but sensor detects if filament moves on

Yes it has a filament movement detection.
But it need to be activated in the settings first.

The U1 uses an odometer-wheel sensor; as soon as the filament stops moving at the wrong time, it throws an error.

pretty cool, thats what i’m asking.

and it needs to be enabled or is enabled by default?