nostr:npub1ng652jn27r9m4hnna0n0x8vdzu3kyhtwxkzxmhrfs3ravwh52zuq72pghq Start here: https://www.printables.com/model/59227-zx82net-ultimate-parametric-rugged-box-snap-closur

There are a ton of them, though that one seems the most popular... A lot use Fusion360 which I dot not use... 

This is the OpenSCAD one: https://www.printables.com/model/168664-parametrizable-rugged-box-openscad

I'll check exactly which files I used for the larger one.