18500 Battery holder

I design a 18500 holder which could easily be stored in a backpack, and dont use to much space. I have printed this one in TPU go get a good grip on the batteries. The batteries i have measure 18,20 in diameter and i made the holes in the print to be 18,30, which holdes the battery but dont make them to hard to pull out.

I have made a test print whit the same measurements, available under thing files.