Textures problem for 3d printing

Hello everybody,

i would like some help please. I am trying to export one model with multiple textures for 3d printing and i have problems with textures. Although the UVs are correct, i see one color between 2 edges. This is happening when i zoom out. When i zoom in i dont see anything so i can`t correct. The problem is that when i export as .obj this line is there and i am afraid that if i print, the line will be printed. I am using Blender 2.68a for Mac. The Printer is Z650 Full color from 3dSystems.

I really hope that someone can help.