The Glam Squad
What's glow-in-the-dark filament?
A base plastic (PLA or PETG) filled with strontium aluminate, which soaks up light and glows in the dark.
- Glows withstrontium aluminate
- Needsa hardened nozzle
- Charge it withUV light
Base plasticPLA or PETGMixed instrontium aluminate (the glowing powder)
Why it matters
- Most of the glow comes in the first 1.5 hours; in total darkness a weak glow lasts 6–8 hours (Prusament PETG Ultraglow).
- The powder is very abrasive: Prusa calls its glow PETG the most abrasive material it has made.
Tips from the workshop
- Use a hardened nozzle; Prusa recommends 0.6 mm and a standard (not high-flow) nozzle.
- Charge it under UV light. Daylight or a strong LED work, slower; a warm, weak bulb barely does.