Hi DesusDeus,

Add this in your shortcut list :

script:var gd = moi.geometryDatabase; gd.deselectAll(); var breps = gd.getObjects().getBreps(); for ( var i = 0; i < breps.length; ++i ) breps.item(i).getNakedEdges().set

I personnaly map it on the 'N' key (for naked) ... it will highlight naked surface problem ... actually there is something wrong on the top

You can actually fixed it by>Joining your surface
>Select your object
>Hit Planar

If will fill the micro naked open surface, so you end with a solid ...

You probably better to restart the surface from scratch, must be something wrong in your buidling method