Hi,

There was a small gap in the geometry where you booleaned (not sure why unless you have the model before the booleans) + an extra face near the back

If you are using V2 (beta) of MoI then you can use the script to show any naked edges which at least points you in the correct direction.

The script is:-
script:var gd = moi.geometryDatabase; gd.deselectAll(); var breps = gd.getObjects().getBreps(); for ( var i = 0; i < breps.length; ++i ) breps.item(i).getNakedEdges().setProperty( 'selected', true );

I have attached a copy of your model which is now solid.

- Steve

EDIT,

Updated model

Hello again,

I just booleaned away the other side of the model with those sweep pieces, again it has left a problem. It looks like there is a problem due to the boolened parts overlapping.

If you look at those 2 part you can see where they overlap.

Thanks guys, the script to expose naked surfaces is especially helpful.