Prusament PETG Ultraglow Green 800g (NFC)

Prusament PETG Ultraglow green is the brightest glow-in-the-dark filament on the market. It is filled with the highest possible amount of strontium aluminate, which is a safe alternative to previously used Phosphorus. We used the maximum we could achieve while maintaining reliable printability and delivering exceptionally bright luminescence. We felt like there was no strong reason to make another mediocre glow-in-the-dark PLA filament, as the market already has plenty. Instead, we did what we do best: we took it up to eleven.

Glows all night long

Visible glow after 6-8 hours

Prusament PETG Ultraglow can be charged by exposing it to both UV (most effective) and visible light sources. When charged, the filament glows strongly for several minutes, then the glow intensity gradually decreases. In total darkness, a weak glow can be visible even after 6-8 hours after charging.

Brightest of them all

Filled with glowing powder to the maximum

We ordered other branded glowing filaments and put them all to the test. We've kept the other brands anonymous, as the results speak for themselves. Prusament PETG Ultraglow shines by far the brightest when compared to common glow-in-the-dark PLA.

Bonded in Prusament PETG

For better mechanical and temperature resistance

We deliberately chose PETG as the base polymer for a reason: it's stronger than commonly used PLA and resists higher temperatures, making it suitable for functional parts. And you can take it further with the XL and other multimaterial solutions. Print functional models in standard PETG and add glowing accents to highlight specific components - switches, handles, indicators, or any part that needs visibility in low light.

Printing Setup

Basic Attributes

New spools equipped with OpenPrintTag

Prusament filaments are wound on a redesigned spool that introduces several improvements for an even better printing experience, starting in October 2025. The new spool features a simple locking mechanism that makes disassembly quick and easy, allowing effortless refills. It also stays secure during filament drying, even at higher temperatures. And with its slimmer dimensions, the spool ensures compatibility with a wide range of multi-color and multi-material printing systems.

Every new Prusament spool now comes with a fully rewritable NFC tag powered by the OpenPrintTag standard. It’s designed to work across brands and ecosystems. It is free to use, free to extend, and open for anyone to build upon. Most importantly, it works entirely offline. All essential data is stored directly on the tag. Your printer can recognize the spool instantly, with no dependence on cloud services or vendor lock-ins. The OpenPrintTag attached to your Prusament spool contains essential data about the material and can be read with the Prusa mobile app.

Read more in our announcement article.

Beginners tips & tricks

1. Use a hardened nozzle! This is the most abrasive material we’ve ever made. This thing eats our manufacturing line's metal components like they were nothing. It will destroy your brass nozzle in no time.
2. Expect accelerated wear on PTFE tubes and hardened components. This includes hardened steel nozzles and Nextruder gears. Occasional printing won't be an issue, but regular high-volume use will shorten the lifespan of metallic components. If you want to be 100% sure, you can use the E3D DiamondBack nozzle, which is harder than strontium aluminate and won't wear out.
3. A 0.6 mm nozzle diameter is recommended. While we provide 0.4 mm profiles, we strongly recommend larger diameters to prevent clogging. Standard (non-high-flow) nozzles work better for this material.
4. Dry the filament before use (optional). While PETG doesn't absorb moisture as readily as some filaments, drying after prolonged storage significantly reduces stringing, oozing, and clogging - especially important for multi-color printing (XL).

For detailed information about print preparation, such as setting your XL and lowering friction in long PTFE tubes, see our online help article.

Notes

This PETG is made in-house by Prusa Research.

1.75 mm filament is manufactured with a precision of ±0.04 mm.

Before printing, make sure the surface of heatbed is clean as described in 3D Printing Handbook.

Featured models

Safety signs and guiding arrows
(glowing Emergency Exit Sign by The Kit Card Guy, Skirting Arrow by SteveW91 and Diving arrow by Jakub Kočí)

Glowing parts to prevent losing
(Nordic Knurled EDC Capsule by DFV Tech and Mix of models by Prusa)

Glowing frames for doorlocks, light switches and more
(Glow in the dark doorlock finder by Ronny)