@evilsocket's pwnagotchi project is amazing!
The tolerances are tight to keep your pwnagotchi snug. I have made several of these now and I can tell you that there will always be differences in how well they fit into the case. If you don't want to adjust the drawing and reprint for a perfect then fit I recommend folding a small piece of paper and putting in inside the lid to close up any gap.
I've included the step files so you can make it your own. Anyone who doesn't do this is lame. (⌐■_■)
This is now v3 of the case: