Brand New Prusament release - pre order approx 10 working days - special pre order price
About PETG Ultraglow Green
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. Prusa used the maximum we could achieve while maintaining reliable printability and delivering exceptionally bright luminescence. They felt like there was no strong reason to make another mediocre glow-in-the-dark PLA filament, as the market already has plenty. Instead, they 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
Nozzle 260 ±10 °C
Heatbed 85 ±10 °C
Recommended Steel Sheet Textured / Satin
Before printing, learn about print surface preparation in our dedicated article and material table.
Basic Attributes
Brightest glow-in-the-dark filament on the market
Good high-temperature resistance
Low shrinking and warping
High strength and durability
Highly abrasive material: Needs a hardened nozzle, and accelerated wear on printer components should be expected
0.6 mm nozzle diameter recommended
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.
What can you expect?
Prusament PETG Ultraglow is our own in-house made filament. The whole manufacturing process is closely monitored and tested - we guarantee ±0.04mm precision and highly-consistent colors. You can inspect parameters of every spool we made at prusament.com. Check the sample spool!
The whole manufacturing process is closely monitored and tested – string diameter, color consistency, and mechanical properties – to make sure that every spool is perfect.
Beginners tips & tricks
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.
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.
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.
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.
Downloads
Brand New Prusament release - pre order approx 10 working days - special pre order price
About PETG Ultraglow Green
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. Prusa used the maximum we could achieve while maintaining reliable printability and delivering exceptionally bright luminescence. They felt like there was no strong reason to make another mediocre glow-in-the-dark PLA filament, as the market already has plenty. Instead, they 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
Nozzle 260 ±10 °C
Heatbed 85 ±10 °C
Recommended Steel Sheet Textured / Satin
Before printing, learn about print surface preparation in our dedicated article and material table.
Basic Attributes
Brightest glow-in-the-dark filament on the market
Good high-temperature resistance
Low shrinking and warping
High strength and durability
Highly abrasive material: Needs a hardened nozzle, and accelerated wear on printer components should be expected
0.6 mm nozzle diameter recommended
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.
What can you expect?
Prusament PETG Ultraglow is our own in-house made filament. The whole manufacturing process is closely monitored and tested - we guarantee ±0.04mm precision and highly-consistent colors. You can inspect parameters of every spool we made at prusament.com. Check the sample spool!
The whole manufacturing process is closely monitored and tested – string diameter, color consistency, and mechanical properties – to make sure that every spool is perfect.
Beginners tips & tricks
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.
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.
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.
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.
Downloads
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