How can I move two object next to each other while keeping their positions pixel perfect?

I am using built in 3D cubes (10x10x1) as platforms. Each platform snapped to the next one and I use the built in grid (10x10) as well but when I am playing, I got these annoying bugging lines like this.

It is important to build a level using these detached cubes rather than create only one model in Maya as a level, because there are some other scripts which needs to be applied to some cubes, so they has to be detached models. Is there any way to get rid of this? I guess it is because the position is a float value which has a minimal inaccuracy.