An extremely simple design that anyone could have come up with, so just sharing some simple work.
Obviously you have to use glow in the dark filament for this, I
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made the tags small enough that they don't get in the way of anything or interfere with the use of whatever they're attached to (combined with a 10mm split ring). For use on bag/tent zips, pocket knife, keys, torch, anything that you might need to locate in the dark.
Printed at 75% infill, doesn't glow brightly after the initial 5 mins but still visible in total darkness 8 hours later.
