An alternative to the many different kinds of 18650 battery holders, I made this so you customize it to make it fit your needs.
Be sure to test a 1x1 before you make larger combination, the diameter of 18650's can actually be more then 18mm it can be 18.4mm for example. To compensate for this the diameter of the hole is now the diameter of the given battery + .4mm.
The diameter of the battery can be changed also, so this can be used with any type of circular battery you want.
If you find this helpful please leave a comment or post a make :)