Black line on flat pattern

[wowrs1608]

Hi,

What the black line means? Is this one right? 

2022 Version

Regards

Pete

[johnsonshiue]

Hi! This is because the seam creates overlapped flanges. When they are unfolded, they collide. You may want to suppress the Corner4 to see the issue. The seam in this case does not make sense. It will work if the flanges are flipped to the opposite direction.

Many thanks!