I uploaded a parametric box yesterday and mentioned I thought of better designs after printing it. This is the fourth of those.
It's a bit different than a typical box. Eah part includes three sides. This makes both pieces great for display purposes or to use as a draw/discard pile. There's two handles on both parts that can double as feet so that both are great display stands and both provide a good view of the item. The parts can only go together one way.
Inside the Fusion 360 file, there are user parameters you can edit to change the size of the box or the walls or whatever, really. There is also a component called "STL Gen" that should have the objects oriented in the best position to print.
Disclaimer: I haven't had a need to print this yet, but it should work great. You might need to change the slider_tolerance for your printer or if you print at a lower layer height. I'm not sure how well this will actually work, but if it works as planned, it'll be amazing.
Parametric Box 1
Parametric Box 2
Parametric Box 3
Parametric Box 4 - this one
Edit: March 3, 2019
Fixed a sketch that wasn't adjusting with length.