Prusa Launches Ultrabright Prusament PETG Ultraglow Green Filament

Prusa Research launched Prusament PETG Ultraglow Green today, adding an "extremely bright" glow-in-the-dark PETG to its Prusament line. The new spool is marketed around a single technical change: Prusa reports it maximized glow-powder loading into a clear PETG base, a move the company positions as the key to higher visible glow performance.

The product name is Prusament PETG Ultraglow Green, and Prusa Research emphasizes material formulation over a color shift or texture change. The company specifically calls out increased glow-powder loading combined with a clear PETG matrix, which should affect how internal pigment sits in the filament and how light charges the material during exposure to daylight or LED lighting.

Prusa released the filament and the Prusament designation on February 25, 2026. The announcement centers on formulation details rather than hardware compatibility or new printer features, so this is primarily a materials play for makers who already run PETG. For anyone who prints glow-in-the-dark parts, the two explicit facts are the material chemistry - PETG with high glow-powder concentration - and the clear base that Prusa chose to pair with that powder.

From hands-on experience with heavily loaded filaments, maximizing powder content tends to change flow behavior and can increase nozzle wear, especially on small orifices. Given Prusa's stated approach of loading more glow particles into a clear PETG base, expect to test retraction, print temperature, and nozzle choice when you try Prusament PETG Ultraglow Green. Prusa Research framed the launch around material formulation rather than print profiles, so dialing in settings will likely be necessary to match the company's brightness claims.

Prusament PETG Ultraglow Green joins Prusa's material lineup as a specialized option for projects that prioritize visible glow. The company's emphasis on maximizing glow-powder loading in a clear PETG base makes this filament notable on paper; the next step will be real-world prints and community profiles to see how Ultraglow Green performs on standard Prusa machines and third-party printers.