I've created a jig that will be bolted to a table. Is there a way to make the wall (or shell) of the bolt hole thicker than the rest of the project? I'm looking to increase the thickness of the bolt hole only.

I am using a Makerbot Replicator 2x with 10% Infill and 3 Shells. I would like more shells around the bolt holes to add strength to them.

Thank you in advance.