These snap boxes started with this video (https://youtu.be/VVmOtM60VWw?si=1R1f-qceWC1O9Flh) by Adafruit Industries. Go subscribe!

I wanted a basic box with just enough of the basics done that I could then reuse for other projects.

This done in Fusion360. You need Fusion (free version works fine) to do this.
(Or maybe some other CAD software will also read the f3d file - I don't know...)

Parameters are;
Height, Width, Length (of the box itself)
Shell - thickness of the walls
Gap - spacing between adjacent components
Coverheight - the thickness of the cover/lid
Chamfer - how "tight" the "snap" is. (smaller chamfer = tighter fit)
Casefillet - how round the corners are
Innerfillet - inside fillets
Outerfillet - outer fillets
Lifillet - the "finger gap" between the box and the lid (if needed - helps to open the box)

Setting the parameters to silly values will break it.

Use. Abuse. Share. Enjoy. Or not.

Happy making :-)

No promises, but if you ask nicely for a specific size, who knows - I might...

PS - I actually wanted to do round dust port adapters for my random collection of tools and vacuums and just started with a box to learn.
Then I saw harmo_hammer's "Fully parametric, BENDING circular dust port adaptor" (thing 6455859) and now I don't have to.. :-)

Thanks Harmo_hammer  (https://www.thingiverse.com/thing:6455859) !