What causes these blobby corners Contrary to a lot of other corner related problems (where the corners are bulging), I seem to have a different problem where the corners (ONLY) seem to stick out and appear blobby in the x/y plane. This only happens for corners/edges with a fillet radius greater than 3-4mm and only in the x/y plane. Anything smaller than that radius (such a sharp corner/edge) seems to be fine. 

Any ideas what could be causing this? 

Conditions


CR-10s
Ultimaker Cura v4.2.1
Material: ABS 
Nozzle size: 0.4mm 
Bed temp: 80&nbsp;&deg;C (I can't go any higher than this) 
Nozzle temp: 250&nbsp;&deg;C


What I've tried already


increasing nozzle temp from 240 to 250&nbsp;&deg;C (seemed to help slightly?) 
reduced flow rate from 100&nbsp;% to 80&nbsp;% - had a negative effect on overall print quality 


Thank in advance for any ideas/suggestions
I suspect you are printing through a usb or network connection,  and the communication rate it's to slow for any of many reasons.   A curve consists of many tiny linear movements,  each requiring a command exchange between the PC and printer. 

If you can,  try printing from an sd card plugged into the printer (I'd the printer is so equipped).

This could be worse if the uses a Bowden extruder,  since there is now compression and windup in the filament.