Defect when printing with ABS

[gxryy]

Hi all,

I am having some problem printing the corners of my model.. its coming out very distorted as in the attached picture.
I can't figure out what's wrong. I have tried changing the print speed from 60 to 45 but to no avail..

is it over extruding at at the corners?
It seem like the printed part is still mushy

https://youtu.be/DJkNnTQhug8