Filament Balling up on random parts of a print The skirt prints out ok, but there is balling up of filament on some of the prints.

I am printing 50 small parts at a go, and the last 4 batches were perfect, but the fifth batch had filament problems like on the photo.

Any advice?

Thanks
I experienced that several times if my print temperature was too low. Then, the filament does not stick to the plate very well and prefers to stick to the nozzle which pulls it away. Solution is to increase the temperature by 5 to 10 degrees, at least for the first layers..