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.

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

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