16650 to 18650 Battery Adapter
thingiverse
This is an easy battery adapter designed to transform a 16650 battery into a 18650 battery, size-wise. My 16650 battery didn't fit snugly in the flashlight, so I created this simple adapter for a perfect match. I printed it with a 0.4mm nozzle and two solid walls to eliminate any air gap between the outer walls. Don't print it in vase mode!
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