Parametric Adjustable Box

This is a box whose dimensions can be parametrically altered to be (theoretically) any size you wish.
I highly recommend you check out the video below to explain in depth how this works, but I’ve included written instructions below.
In order to make your own custom-sized box, you need to download Fusion 360 here: https://www.autodesk.com/products/fusion-360/overview?term=1-YEAR&tab=subscription .
It has a trial version and a free license for hobbyists, which is what I use. Once you’ve downloaded the .3mf file from here, you can open it up there.
You should see the model, and on the top, you should look at the top bar and click on the dropdown menu on Modify, then click “change parameters” (second one down with the fx symbol next to it).
You should see the “length,” “width,” and “height” parameters. You can enter in different values under “expression” to change their value.
NOTE: these are the dimensions of the inside of the box. The original purpose of this box was to be used as a pr