Waterproof Dustproof Diamond Container

This is a diamond shaped container. If printed right it´s waterproof and dustproof.
For this project you need an o-ring with 50-54mm inside diameter and 3mm thickness.
Let me know if the cap is to tight or to loose! I´m going to ad a tight fit and a loose fit cap.
With my printer and my settings this design works realy well but other printers other results.

Help me to optimize this project!

Hint: If your cap is to tight you dont have to reprint! Just sand it down with fine sandingpaper til it closes nicely.