Modular 18650 Battery Holder

I recently acquired a couple hundred 18650 lithium ion batteries and I needed a way to mount them for a couple different projects I’m prototyping.

Design requirements:
-No spot welding
-Minimal material needed for print
-Fast, easy print (preferably no supports needed)
-Single object (can be used for + or – side)
-Multiple solder points between adjacent cells for high and even current flow
-Small airgap between batteries for better cooling
-Very modular (can be used in either series