3x3 18650 holder
thingiverse
I salvaged a bunch of different 18650s and didn't feel at ease with them just sitting around in a bag or drawer loose where they might short out on something, so I made this holder. It was a bit too tight on my 18650s but that was because some of the bumps were blocking the way, I took a file to them and it fit nice and snug now.
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