16kg at $22.49/kg | 41% Off | UV-Reactive, Phosphorescent, Free USA Shipping
Sixteen kilograms of Glow in the Dark PLA+. Vacuum-sealed per spool. Free shipping across the USA. At $22.49/kg — 41% off individual pricing — this is the production-scale pack for cosplay vendors, novelty product sellers, event planners, and anyone printing glow items at volume.
⚠️ Before you load this filament: you need a hardened steel nozzle. Glow in the dark filament contains strontium aluminate — a phosphorescent powder that creates the glow effect but acts like fine sandpaper inside a standard brass nozzle. A brass nozzle will wear rapidly with regular glow printing. If you're running this at production scale (16kg), a hardened steel nozzle is not optional — it's the first purchase to make before this pack arrives.
How Glow in the Dark Filament Actually Works
Think of a glow star sticker on a bedroom ceiling. You leave the light on, the sticker absorbs energy, you turn the light off — it glows. That's phosphorescence, and it's exactly what's happening inside this filament.
The active ingredient is strontium aluminate — a hard, crystalline powder mixed into the PLA+ base. When light hits your finished print, those crystals absorb the photons (light particles) and store the energy. In the dark, they release it slowly as visible light — the glow you see. No batteries. No electronics. Just chemistry.
Key facts about the glow effect:
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UV light charges fastest and brightest — a UV flashlight or blacklight charges the print almost instantly. Direct sunlight (10–15 minutes) works excellently. Indoor LED or fluorescent light works, but takes longer and produces a less intense result.
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Glow is always brightest right after charging and fades gradually. That fade is the physics of phosphorescence — not a defect.
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Thicker prints glow longer — more phosphorescent material in the print = more stored energy = longer glow duration. Increase wall count and infill on pieces where maximum glow time matters.
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Smooth surfaces glow more evenly — rough layer lines scatter the emitted light. Better surface finish = more uniform, cleaner-looking glow.
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Green and blue variants glow most intensely — strontium aluminate's natural emission peaks in the green spectrum. Green and blue color variants consistently outperform red and violet for brightness and glow duration.
⚠️ Critical Hardware Requirements
| Requirement |
Why It Matters |
| Hardened steel nozzle — required for regular use |
Strontium aluminate particles are extremely hard. They grind against the inside of a brass nozzle the same way sandpaper grinds wood. At 16kg of volume, a brass nozzle will fail. Hardened steel, ruby, or tungsten carbide nozzles handle abrasive filaments without degradation. |
| Nozzle diameter: 0.4mm minimum, 0.5–0.6mm recommended |
Wider nozzles reduce the abrasion rate and embed more phosphorescent particles per layer — which improves glow intensity. For production runs where print detail isn't the priority, 0.6mm is the sweet spot. |
| No sharp bends in filament path |
The strontium aluminate powder makes glow filament more brittle than standard PLA+. Bowden setups with tight curves can cause snapping mid-print. Keep the filament path as straight as possible. |
| AMS / multi-material systems: test first |
The stiffness and abrasiveness of glow filament can cause feeding issues in systems with circuitous internal paths (e.g., Bambu AMS Lite). Run a single-spool test before committing to an automated multi-spool setup. An external spool holder with manual feed is the reliable fallback. |
Pack Contents & Value Breakdown
| Spec |
Detail |
| Pack size |
16 × 1kg spools (16kg total / 35.2 lbs) |
| Material |
Glow in the Dark PLA+ (strontium aluminate phosphorescent pigment) |
| Filament diameter |
1.75mm ±0.02mm |
| Price per kg |
$22.49 (41% off individual spool pricing) |
| Packaging |
Vacuum-sealed with desiccant — each spool individually sealed |
| Shipping |
Free across the USA |
Print Settings for Glow in the Dark PLA+
Glow PLA+ prints like standard PLA+ in most ways — same base polymer, similar temperatures. The key differences are slightly slower speeds for better glow particle embedding, and the mandatory hardened nozzle.
| Setting |
Recommended Range |
Notes |
| Nozzle temperature |
210–230°C |
Start at 215°C. Using a hardened steel nozzle? Raise 5°C — steel conducts heat less efficiently than brass, so the filament needs slightly more heat to flow cleanly. |
| Bed temperature |
55–70°C |
60°C on PEI is the standard. Blue painter's tape on glass also works well for this material. Never exceed 70°C — high bed temps can degrade the phosphorescent pigment. |
| Enclosure |
Not required |
Open-frame printers work fine. PLA+ base means no warping issues. |
| Part cooling fan |
Full (100%) after first 2 layers |
Strong cooling reduces surface blobs and keeps layer lines sharp — which directly improves glow uniformity on the finished surface. |
| Print speed |
40–60mm/s |
Slower than standard PLA+ — lower speed gives phosphorescent particles more time to settle evenly in each layer, producing a more uniform glow across the surface. |
| First layer speed |
15–25mm/s |
Always slow the first layer for reliable bed adhesion. |
| Nozzle diameter |
0.4mm (minimum) / 0.5–0.6mm (recommended) |
Wider nozzle = less abrasion per mm of filament + more glow particles per layer. 0.6mm is the production sweet spot. |
| Layer height |
0.2–0.3mm |
Thicker layers embed more phosphorescent material = brighter, longer glow. For display or decorative items, 0.3mm layers are optimal. |
| Wall count (for glow intensity) |
3–4 walls minimum |
More walls = more glowing material in the part = longer glow duration. For items where maximum glow time is the goal, go 4+ walls. |
| Retraction — Direct Drive |
1.5–2mm at 40mm/s |
Don't over-retract — glow filament is more brittle than standard PLA+ and can snap at the extruder if retraction is too aggressive. |
| Retraction — Bowden |
4–5mm at 40mm/s |
Keep Bowden tube path as straight as possible to prevent snapping. |
| Drying (if needed) |
50–55°C for 4–6 hours |
⚠️ Phosphorescent pigments are moisture-sensitive. Wet glow filament loses glow intensity AND prints poorly. Keep sealed until use and store open spools with desiccant — especially in humid climates. |
Getting Maximum Glow From Your Prints — Design Tips
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Charge under UV for fastest, brightest results — 10–15 minutes under a UV flashlight or blacklight produces a significantly more intense glow than indoor lighting. For display products and cosplay, a UV charging station pays for itself in customer reactions.
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Rotate while charging — ensure all faces get equal UV exposure. Uneven charging creates uneven glow spots on the final piece.
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Smooth top surfaces glow most evenly — enable ironing in your slicer for display pieces. Rough layer lines scatter the emitted light and produce a patchy, uneven glow effect.
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Avoid dark-colored environments for display — glow works best when the room goes fully dark. Even low ambient light reduces the perceived intensity of the effect.
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Control glow intensity through design — you can vary glow brightness across a single print by adjusting wall thickness in different zones. Thicker sections glow brighter and longer.
Best Applications for This Pack
| Application |
Why Glow PLA+ Works |
| Cosplay props and armor |
Glowing elements that activate under UV blacklights at conventions — no electronics, no batteries, no wiring. |
| Novelty and gift products |
Keychains, figurines, desk ornaments, and display pieces with a tactile glow effect that photographs dramatically for product listings. |
| Event and party props |
Glow-activated table centerpieces, signage, and props for blacklight events, escape rooms, and themed environments. |
| Kids' room decor |
Stars, moons, name signs, and nightlight frames that charge during the day and provide soft ambient glow at night. |
| Safety and wayfinding markers |
Emergency exit markers, step edge indicators, and low-light signage that remain visible after power failure. |
| Educational models |
Astronomy models, molecular structures, and science fair exhibits that demonstrate phosphorescence and light absorption concepts. |
Storing 16 Glow Spools
Glow filament has an extra storage consideration beyond standard PLA+: the phosphorescent pigment is moisture-sensitive. Wet pigment loses glow intensity before it even affects print quality — so you might not notice the problem until you see a finished print that barely glows.
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Keep sealed until the spool goes on the printer — each spool ships vacuum-sealed with desiccant. Don't open stock spools in advance.
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Open spools go in airtight containers with fresh desiccant, ideally within 24–48 hours of opening if you're in a humid climate.
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Store in a cool, dark place — prolonged light exposure before printing doesn't "pre-charge" the filament helpfully; it can gradually degrade the pigment over time. Keep stock spools away from direct sunlight or strong UV sources.
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Same-batch consistency: all 16 spools ship from the same manufacturing batch — matched glow intensity and color across your entire production run.
Who Is This 16-Pack For?
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Cosplay vendors and prop makers producing glow elements at event scale — convention season runs fast, and 16kg ensures you don't run out of your most dramatic material mid-production.
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Novelty and gift product sellers on Etsy and Amazon who have validated the market for glow items and are ready to move from per-spool ordering to production pricing.
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Event production companies building props, signage, and environmental elements for blacklight events, escape rooms, and themed installations where glow is a core design requirement.
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Print farms adding a specialty SKU — glow products command a significant price premium over standard PLA items. At 41% off, the margin math on glow items at production scale is compelling.
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Educational institutions running STEM programs where glow filament is used to demonstrate photophysics, light-matter interaction, and material science in a way that holds student attention.
Browse individual spools in our Glow in the Dark Filament collection. Explore everything in our 3D Printing Filaments guide.
