I had my local library 3D print a case for my air for me using the provides stl files..
The bottom fit fine.
One minor issue I noticed with the top The single width slots on the left and the right work fine if you are inserting a plain wire. I noticed however if your wire you are using has the end crimped on or if the wire is shrink wrapped at the end the slots are too narrow for the wire to fit.
So if you ever revamp the case files, it would be great if the slots were just a bit wider to fit the ends through.
But over all the case works very well and thank you for providing the files.