A 3D printer's Jerk/Junction Deviation setting affects the printing of corners. A low Jerk setting makes the printer move slowly through the corners - but too low and you could have blobbing and slow printing. Tighter corners cause more slowdown. A high Jerk setting causes the printer to move quicker through the corners - increasing print speed - but too high and the printer will vibrate more, causing waves in the outer perimeter (ringing) and other issues - possible including missed steps.