Box lid inner lip

Hello everyone
Brand new to CAD and Shapr3d here. After a couple of tutorials, I threw together a quick box and lid to practice some of what I learned. As you can see, there is a lip on one side to enable the halves to fit together. I used offset to create the lip. However, this would be a very exact fit as there is no tolerance. I’m wondering the easiest way to either thin out the other box half walls to allow a bit of tolerance for fit. I’ve tried a couple of different things and so far, I haven’t found the solution. Thanks!

Edit: Jeez…I didn’t realize that it was the simplest of answers. I simply selected each inside face and narrowed the width by .2. For some reason that wasn’t obvious to me the first time around.

Depending on the printer, you may be able to use a 0.1mm tolerance.

It’s going to be a Bambu Mini - I think I read that it’s tolerance is .02, but I’ll check