How does a glow filament actually work, and what should I expect from it?
The strand is PLA compounded with phosphorescent pigment. Light falling on the printed surface charges that pigment, and the part then gives off a soft glow on its own in a dark room - a luminous effect built into the material, not a coating that can peel off and not reflective tape. How strongly and how long a part keeps glowing after the lights go out depends on the light it received and on the thickness of the printed wall, so treat the glow as a qualitative feature and judge it on a printed sample in your own lighting rather than from a photograph.
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