When I'm printing with my Chromatik filament white, 1.75 mm in diameter, I observe a gap between the infill and the walls (see picture).
Everywhere on the web I can find explanations for this kind of problem (apparently it's the symptom of loose belts), but I have this problem for this filament only. I have the filaments Chromatik electric blue and Octofiber black and I don't have this issue with them. I tried to increase the temperature by ~10 °C, but it didn't have much effect.
Have you ever seen that guys? I repeat, it's with this filament only.