18650 Battery holder case

Inspired by this battery case. 

This battery holder doesn't require extra metal parts. Spring is integrated into the case.

By default case has precise fit for 18650 cells and hold them well in place. It could be hard to remove cell, so, if you want cell to be easy removable - scale case by 1-2%. 

Please, leave your feedback. I'd like to hear your thoughts and see your make.