Infill not reaching perimeter I've got several examples like the image below where the perimeter either doesn't bond to, or doesn't reach the infill. I tried adjusting the infil overlap parameter in Slic3r from its default of 25% to 30%, but it doesn't seem to have made a difference. This is on a new Tevo Tornado that's all stock + a petsfang bullseye cooler.

Edit 

neither speed variations, nor temp variation seems to impact this issue. I'm beginning to suspect that it's related to some sort of play in the y axis, as if you look at the defect in the picture, it's the most pronounced running north/south in the picture, which would be layers along the x axis (meaning their relative position would be impacted by y axis movement instability). I'm replacing the leveling springs with PETG standoffs tonight (I have a BLTouch) and will try again then.

I tried 25, 30, and 50% infill overlap as per a comment request, and that (50%)seems to have improved another issue where the infill on a first layer would often not reach the perimeter shells. 

I tried the following print speeds with all of the following temperatures- 190/60, 193/65, 193/70, with 3 perimeters.



That's default behavior. I've also gone to

Perimeters - 80
Small perimeters - 20
Infill - 90
Solid infil - 25
Top solid infil - 20
Bridges - 70
Gap fill - 25


With no visible change in this outer perimeter behavior (the faster set of numbers is what I print with in general).
This has nothing to do with the infill overlap, the image you've added looks as if the issue is related to non-bonding perimeters (it looks as if it is in between the 2nd and the 3rd perimeter). If that is the case look into this question.

I've had this same issue, the problem is that if the perimeters do not touch, this is most probably caused by insufficient filament flow which can be a result of a too high of a print speed (or too low print temperature) of the inner perimeters.