Any idea why boarders of volumes has this artefact?

[abraminmotion]

Here's the file if anyone wants to take a look:

https://www.dropbox.com/s/1icpiqi1yp8q4 ... d.c4d?dl=0

[abraminmotion]

Thanks! It appears it was the step length.

Going through the guide now- thanks for that. I'm not sure which settings is inappropriate though. Is there a specific setting that you see that I need to pay attention to? Thanks again!