Does this happen on higher layers? Above 3rd layer? If not then maybe it's a "bed leveling" issue: If that corner of the bed is slightly lower then the first layer isn't squished as flat and wide as on other parts of the bed. More likely illuminarti is right and things aren't lined up. Looking from above, see if the long belts line up with the rods perfectly parallel. Move your eye around until the edges line up. Do this under good, bright lighting. You might need to move a pulley a few mm to either side to get it to line up better. Try moving the print head and see if the belt is always straight or starts to head towards the pulley at a steeper angle as it gets closer.
Try powering off the machine and moving the head by hand, using light fingertip pressure on the sliding blocks. Both axes should move fairly easily and smoothly, and with equal pressure for both. Is there more friction in that corner of the bed?
Link to post
Share on other sites