Box where you can select your own code to open it. The code can be selected by placing locks into positions in box body. 

Instructions for printing: 

1. the box body print upside down with layer thickness 0.15mm 
2. cover print in height here doesnt much depend on layer thicness 
3. locks and lock keys print as last items and try to print one if it fits properly. They are shouldnt move too much freely but not too much tight. 
4. you can print lock keys with numbers or write own numbers or pictures on it. 
    

Assembling: 

1. place locks to select your code 
2. the bottom is better to be glued because bridging is not visualy nice.
3. set lock keys on the same position on the box cover 
4. close cover
5. push the lock keys inside
    

PS: on the cover are topological numbers for better orientation which lock you are opening ;)