You can basically draw a 2 pixel width grid with standard squares in black.
Maybe someone else has a better idea but here's what I was thinking: There may be some other way, but I dont know of it. So my first question is, how do you feel about little white dots or possibly switching to a standard grid? Probably not, so I beat myself up a little trying to figure out if median will work. those off angles never work out right to merge the gaps using something like Median. Hex grid is most frustrating to do something like this with.
