I just finished this pattern and mine isn't curving at all. I think it is depending on how tight you do your knots... It is a lovely pattern! I prefer the darker version! ❤️
This is a fun pattern to do! However, be warned that this tends to curve because of how the edge knots are all going the same direction. I would highly recommend using edge strings. I didn't because I was lazy and my bracelet is really starting to show the curve. Will post a pic when finished.
Mooncore
