Okay, so I’ve been messing with the settings in slic3r in order to get my over extrusion to stop. I’m using the medium settings provided at lulzbot.
I did a bit of trouble shooting, I put the filiment diameter up to 3.2mm then down to 2.7.
Here is a picture of the results: http://imgur.com/UG3cvg9
as you can see, there is pretty much no difference, there is still over extrusion (I’m questioning if that’s even the problem!)
I turned down the bridge ratio as well from 1.15 to 0.9. There was a slight improvement.
It seems there is always a giant build up on one of the corners and its only 1cm away from the other corner in the middle of the bed, so I can rule out unlevel bed.
Any input is greatly appreciated! Thank you for reading.