Blending two lines in Illustrator gives me holes

When I try to blend two lines, I keep getting holes in parts of the blend.
I have gotten the advice to increase the number of steps an make the number of points the same but with the same result (the lower image has 300 steps, with 8 points on each path)

Anyone an idea on how I can solve this?
blend1

blend2

edit: few more details:

  • both lines have a stroke of 1 px, no fill
  • the upper blend has 50 steps (not sure about the number of path points though)
  • the lower blend has 300 steps and 8 points in each path

Answer

I think it’s because you have “Align art to pixel grid” switched on. This option is enabled by default if you create a new document from one of the web document presets. I really do wish Adobe would fix this behaviour. It’s a real annoyance and catches many people out.

I get something similar if “Align art to pixel grid” is enabled. The blend is messed up.

enter image description here

However if I switch off the “Align art to pixel grid” option, and recreate the graphic again, there is no problem. The examples below show a 50 step blend, and 300 step blend.

enter image description here

Attribution
Source : Link , Question Author : Vincent , Answer Author : Billy Kerr

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