Use this anytime you need a small hollow box or tray of specific dimensions and wall thickness . For example, this happened to me recently: "It is dinner time and I hear a shriek coming from the kitchen. It's my wife spilling uncooked pasta all over and blaming me because I supposedly put the box away backwards." If you are married you probably understand. Exactly why I got a 3D printer. Simple solution: print a box end. Volia... No more pasta spills at dinner time and I don't have to worry about putting the pasta box away backwards. You can probably come up with other uses for this simple box. It is fully customizable. I hope you find it useful. Rev A: Changed slider bars to input boxes for an improved user experience in Customizer.