The lid uses friction to stay on and is secure. It's simply just a box for your uno cards that I made the because the original cardboard packaging that came with the cards fell apart. This solution is also much more organised. I printed this with supports because I wasn't sure if it needed them but it came out great and the supports were easily removable so I recommend printing this with supports on the text.
I have added a tighter lid variant for those who want the lid to be more secure. I changed the tolerance form 0.4mm to 0.3mm which should keep it in one place while still letting it slide about.