Filament Sunlu PLA Glow In The Dark (blue) — Sunlu PLA Glow TB, PLA glow-in-the-dark 3D printing filament

Sunlu PLA Glow In The Dark (blue) is a PLA-based 3D printing filament that absorbs light and emits a visible glow in darkness. Supplied as Sunlu PLA Glow TB on a 1 kg spool, the filament is intended for FDM/FFF printers using 1.75 mm or 3.0 mm feed and is suitable for decorative models, luminous prototypes, cosplay elements and simple safety markers that become visible after exposure to light.

Advantages

The filament contains phosphorescent compounds that produce a clear blue glow after charging by ambient or UV light. It is manufactured with tight diameter tolerances to provide stable feeding and consistent print results, and the spool is vacuum-sealed with desiccant after a 24-hour drying process to minimise moisture-related printing issues. The material is bubble-free and designed for predictable performance across a wide range of common FDM printers.

Suitable for

• Decorative models and night-time ornaments
• Prototypes and visual aids that need to glow in the dark
• Cosplay props and costume elements
• Simple safety markers and signage visible after light exposure

When it may not be suitable

This glow-in-the-dark PLA is not recommended for long-term outdoor exposure in direct sunlight, as prolonged UV and weathering can accelerate colour fading and reduce the glow effect. It is also not intended for high-temperature applications or structural parts that require high heat resistance.

Key specifications

• Material: PLA with phosphorescent additives
• Colour: Blue (glow-in-the-dark)
• Filament diameter: 1.75 mm (also available 3.0 mm)
• Diameter tolerance: ±0.02 mm (manufacturer stated)
• Recommended printing temperature: 200–210°C
• Bed: no heating (use adhesive) or heated bed 50–65°C (no adhesive)
• Recommended printing speed: 50–100 mm/s
• Weight: 1 kg spool
• Density: 1.24 g/cm³
• Water absorption: 0.5%
• Heat deflection temperature: 55°C
• Elongation at break: ~4%
• Tensile strength (typical): 11–16 KGF (factory standard at 23°C, 1.75 mm)
• Melting temperature: 165–180°C
• Melting rate: 7–9 g/10 min (190°C, 2.16 kg)
• Length (approx.): 1.75 mm, 1 kg ≈ 330 m; 3.0 mm, 1 kg ≈ 110 m

How to use

Load the filament into any FDM/FFF printer that supports the selected diameter (1.75 mm or 3.0 mm). Set the nozzle temperature to 200–210°C and the bed configuration according to whether you use adhesion: if printing without a heated bed, apply an adhesive such as glue stick or hair spray; if using a heated bed, set it to 50–65°C and adhesive is not required. Print at moderate speeds (50–100 mm/s) and allow printed parts to charge under ambient or UV light to achieve the strongest glow.

What to consider before purchase

• Confirm your printer supports the chosen filament diameter (1.75 mm or 3.0 mm).
• Consider whether finished parts will be exposed to prolonged sunlight or high temperatures that can reduce glow and cause fading.
• Decide if you need UV exposure to maximise glow intensity for your application.
• Ensure you have appropriate bed adhesion method for the chosen bed temperature.

Usage recommendations

For best glow performance, charge printed parts under bright ambient light or UV for several minutes before use; store unused filament in a dry, resealable bag with desiccant to maintain print quality.