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so somewhere down the line your machine is being given instructions to extrude around 2x the actual required amount.

Well at least my diagnosis was spot on :-)

Sounds daft, but Have you...

have you tried a different nozzle ?

You did check the gears on the stepper motors were all tight.

I have to admit the auto levelling, made absolutely no sense to me and as I have a perfectly flat bed. Just levelled with my adjuster...

what slicer are you using ?

To be fair I get a lot less stringing on my delta than on the makerbot clones.

My retraction settings are 1.8mm and 60mm/s speed.
I get zero stringing between...

pla - look at the temps.

Okay it's definitely not a calibration issue.
Your first layer is going down fine by the look of it and the print is reasonable for at least the first few layers and...