FLASHFORGE GRUS Glow Rainbow Rapid PLA Filament, 1.75 mm, 1 kg

FLASHFORGE GRUS Glow Rainbow Rapid PLA Filament is a 1 kg spool of 1.75 mm PLA marketed for fast printing and glow-in-the-dark prints. Its rainbow color and luminous effect suit decorative models, but customer feedback is mixed on glow strength, compatibility, and adhesion.

At a glance

The listing claims printing speeds up to 500mm/s, depending on printer and settings.
The filament is described as glow-in-the-dark PLA in a rainbow color.
The manufacturer claims glow brightness can last from 5-100 minutes, depending on conditions.
Manufacturer claims include low shrinkage, layer adhesion, bed adhesion, and bridging performance.

Price

$20.79Save 20%

Reference price: ~~$25.99~~

Price checked: Nov 14, 2026

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Often bought together

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$23.99

SUNLU PLA 3D Printer Filament, Black, 1KG | PLA Filament 1.75mm, Smooth Printing, Neatly Wound, +/-0.02mm Accuracy, Compatible with Most FDM 3D Printers

$13.99

Pros and cons

Pros

The 1 kg spool provides a substantial amount of glow-effect PLA for decorative and creative projects.
Rainbow coloring combined with a glow-in-the-dark effect offers a distinct appearance for crafts and night-visible displays.
The claimed high-speed formulation may suit printers configured for rapid PLA printing.

Cons

Customer feedback reports inconsistent glow, with some experiencing little to no glow.
Some customers report printer compatibility or adhesion problems, including clogging.

Technical specifications

6 specifications

Identity
Brand	FLASHFORGE
Model	GRUS

Dimensions and installation
Weight listed	1 kg
Filament diameter	1.75 millimeters

Materials and appearance
Material listed	Polylactic Acid
Color	Glow Rainbow

What to know before buying

The stated glow duration of 5-100 minutes and 310% brightness enhancement are manufacturer claims, not independent measurements. Actual results may vary. The listing's claimed 500mm/s speed also depends on printer capability and settings. Customer feedback is mixed on glow, printer compatibility, and adhesion, so buyers seeking reliable luminous output or trouble-free feeding should account for that variability.

Who is it for?

A good fit for

Decorative prints, crafts, and art projects where rainbow color and a glow effect are priorities.
Owners of printers that support 1.75 mm PLA and can be configured for the intended print speed.

Less suited to

Buyers who need a consistent, guaranteed glow duration or brightness.
Users whose printers are not confirmed to accept 1.75 mm PLA or who want assurance of clog-free feeding.

FLASHFORGE GRUS Glow Rainbow Rapid PLA Filament, 1.75 mm, 1 kg · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 838 ratings

5 stars83%83%
4 stars8%8%
3 stars4%4%
2 stars1%1%
1 star4%4%

Customer feedback praises print performance, rainbow color, appearance, and perceived value, with some customers describing successful out-of-the-box printing. Reports are mixed on glow strength, printer compatibility, and adhesion, including some reports of clogging. For buyers choosing this filament specifically for luminous effects or dependable feeding, those differing experiences matter more than the manufacturer's glow and print-performance claims.

Positive themes

Customers praise print quality and vibrant rainbow colors.
Some customers like the appearance and matte finish, and describe the filament as good value.

Mixed feedback

Glow results vary, with some customers reporting little to no glow.
Feedback on printer compatibility and adhesion is mixed, including reports of clogging.

Frequently asked questions

What printers is this filament for?

It is listed as 1.75 mm PLA filament. Confirm that your printer accepts this diameter and PLA, since customer feedback includes mixed compatibility reports.

How long does the glow last?

The manufacturer claims brightness lasts 5-100 minutes. This is a broad claim rather than a guaranteed duration, and customer feedback on the glow is mixed.

Can it print at 500mm/s?

The listing claims speeds up to 500mm/s, but achievable speed depends on the printer and print settings.

What is included?

The listing identifies a 1 kg spool, but does not provide a separate package inventory.