Make2D is missing a lot of lines

Hi. I was wondering if there is a way to avoid make2d missing so many lines. It becomes quite timeconsuming to manually go and fill these in, as you see here, there are just 20+ in this simple shape. I tried changing the tolerance but unfortunately nothing seems to have changed.

Hello- please post the file or send to tech@mcnneel.com with a link back to this topic in your comments.

-Pascal