was the part still attached to the print bed ? Or had it detached ?

Also you probably need to print a bit hotter. 240-250.

That's not stringing, looks a lot like the part's detached to me.
If that's not the case, let us know :-)

Also try another sd card. And if you are printing via usb or wifi - try it from an sd card.

regardless of what the manufacturers say - printing direct from a card or usb stick is the most reliable.