ewww - that's not stringing - that's either a partially blocked nozzle or a partially blocked nozzle :-)
Or dodgy filament that's blocking the nozzle.

have you got any other pla to try - that might be a duff roll.
I haven't had many bad rolls, but that's pretty much exactly what happens when you get one.

You might also need to change the nozzle. Yeah you can try and clean it up - but at about 50p a nozzle - it's usually easier just sticking a new one in.
And if you clean it with any kind of metal tool - it usually buggers it up anyway.

Bed temp 40c - is kinda low. bit if it sticks it sticks :-)