This is a modified tiny whoop case that I have added parameters to so you can easily make a case of any dimensions for 3d printing rather quickly. Just upload the 2 .f3d files into fusion 360 and set the dimensions to the specs of the whoop you are designing it for.

Dimensions are from outside wall to outside wall, or with height from the bottom surface to the very top edge of the box.
I'd recommend adding 2.00mm to all 3 of your dimension measurements to ensure decent fitment. If you are feeling risky you can try 1.8 or less. If you don't add at least 1.60mm the box will be too small.

Wall Thickness is 1.60mm
The base is 2.0mm thick by default.
"Height" parameter does not effect base thickness, but does include it. Make sure that "Height" - "Floor_Height" is greater than the height of your whoop.
"Corner_radius" has to be less than half of your shortest side (width or height measurement). It can be 0.01 less than half of the shortest side if you want a cylinder. Making it equal makes fusion360 angry.
If you make "Corner_radius" too small the corners that hold the lid on will be too small and not function properly. I would stay above 10mm, 5mm might be ok. Example file is using 10mm. Default is 20mm.

The retaining corners on the lid are 8mm tall, if the box doesn't have 8mm of interior height obviously the lid wont go all the way on.

The friction gap, or tolerance gap, between the retaining corners on the lid and the inner walls of the box is 0.50mm. If you don't have a very dialed in printer this might not be enough, and if you have a very good printer like a bambu this might be too much. You can add to the width/length measurement of the lid to reduce this gap, or you can reduce the measurement for more gap. I've found that 0.20 - 0.30 is pretty good gap size for a p1p printing with petg, but ymmv.