How do I print glow-in-the-dark filament?

Glow filament in this bank arrives as a brittle-PLA question. The nozzle instruction that is actually on a product page is Prusament PETG Ultraglow. The other rows are print temperatures, and two of them have a drying line. Why filament is brittle already quotes the first thread and, for this bank, had no uh9ge7 comments. The drying step is drying. A glow spool that prints once it is dry is still PLA or the PETG row you loaded. PLA and PETG are the hubs.

The comments are the brittle threads

a Reddit thread in r/3Dprinting: "Was it like that when it arrived? If so I wouldn’t accept that shit."

a Reddit thread in r/3Dprinting: "When pla gets old and moist it gets very brittle. But it's way worse with cheap filament usually".

a Reddit thread in r/FixMyPrint: "I've had way more brittle PLA than that and it prints fine. That looks like it took some effort to break to me."

Nozzle and temperatures

Prusament PETG Ultraglow lists 260 ± 10 °C (500 ± 18 °F) and a heatbed of 85 ± 10 °C (185 ± 18 °F). The 16 October 2026 check records the page calling it highly abrasive, requiring a hardened nozzle, and recommending a 0.6 mm hardened non-high-flow nozzle. The same check says drying is optional and that the page does not list a drying temperature or time. The catalog's 55 °C (131 °F) for 6 h on this row is the material default from Prusa's drying article, not that product page.

Overture Glow PLA lists 190–220 °C (374–428 °F), a bed of 25–60 °C (77–140 °F), and drying at 50 °C (122 °F) for 7 h on the product page checked 17 October 2026. The hardened flag is blank. Hatchbox Glow PLA states 180–220 °C (356–428 °F) on the product page checked 19 October 2026 and does not state a bed. The 50–70 °C (122–158 °F) bed is the Open Filament Database cell. Drying is not stored.

Bambu PLA Glow dries at 55 °C (131 °F) for 8 h on its technical data sheet. The 190–230 °C (374–446 °F) nozzle and 50–70 °C (122–158 °F) bed are Open Filament Database cells, and the hardened flag is blank. Which nozzle already cites Bambu's filament guide: glow is one of the particle fills that use hardened steel, and for Bambu glow the first choice named there is a 0.4 mm hardened nozzle. That is the guide, not a sentence in these comments.

Prusament, Overture, Hatchbox, and Bambu Lab are the brand indexes.

Questions