Will-o'-Wisp
thingiverse
This is a post to hold a 5mm Piranha LED on top with a tray for hot glue and a CR1620 battery in the base. I used these to make will-o'-wisp miniatures that light up for dnd, but it could also be used for a torch or any other kind of floating light. In my application I just used the cap to pinch the battery between stripped wires soldered to the LED. If you do this I recommend stripping them extra long to ensure contact. There's no provision for a switch.
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