SUNLU PETG Refill Filament 1.75mm 4-Pack - Tough, Cost-Saving Colors

In this review of the SUNLU PETG Refill Filament 1.75mm 4-pack, the bottom line is straightforward: this kit is for makers who already own reusable spools from SUNLU or Bambu Lab and want a durable, bright PETG option at lower recurring cost. The biggest reason to buy is the combination of enhanced toughness and economy - the refill spools deliver PETG strength and impact resistance while cutting waste and expense when paired with compatible reusable spools. It is a practical choice for functional prints and colorful prototypes when handled with the recommended settings.

Key Features

• Refill format: Designed to be loaded onto SUNLU or Bambu Lab reusable spools so you save on packaging and reduce filament cost per print.
• PETG blend: Balances the toughness of PETG with ease of use to produce durable parts that resist cracking under stress.
• Superior compatibility: Works with SUNLU and Bambu Lab reusable spools and can be used with custom-printed spools for broad printer fit.
• High impact strength: Prints parts that withstand bumps and drops, making it suitable for functional components and repeated handling.
• Smooth printing: Engineered to reduce stringing and clogging so prints run consistently when tuned to the recommended settings.
• Vacuum packaging: Arrives sealed to stay moisture-free, preserving filament quality until you load it onto a spool.

Who It's For

This refill pack is ideal for hobbyists, small workshops, and prototypers who already use reusable spools from SUNLU or Bambu Lab and want to lower material costs without sacrificing strength. The bright Sunny Orange, Yellow, Green, and Lavender Purple make it useful for visible parts, colorful prototypes, and models that need to be noticed.

It is not for users who expect a ready-to-install spool out of the box; beginners without reusable spools or those who prefer cartridge-style spools should look elsewhere. Also, if extreme flexibility or rubber-like properties are required, a TPU filament would be a better match than PETG.

Pros & Cons

Pros

• Durable prints with enhanced toughness and good impact resistance for functional parts.
• Economy pack reduces cost when used with reusable spools, offering value for frequent printers.
• Colors are vivid and generally accurate, with at least one report of a bright UV-reactive neon hue.
• Vacuum-sealed packaging helps prevent moisture-related print issues before use.

Cons

• Cannot be used directly; you must install it on a compatible reusable spool, which adds a setup step.
• Some users report mixed adhesion and stringing behavior, so tuning print settings may be necessary.

Specifications

Material	PETG refill filament
Diameter	1.75mm
Pack size	4 spools, 1kg per spool
Colors	Sunny Orange, Yellow, Green, Lavender Purple
Compatibility	Reusable spools from SUNLU and Bambu Lab; printable custom spools
Recommended nozzle temp	240-260C
Recommended bed temp	60-70C

Our Verdict

The SUNLU PETG Refill Filament 1.75mm 4-pack is a smart buy for experienced users who already own compatible reusable spools and want sturdy, brightly colored PETG at a lower recurring cost. It offers reliable toughness, vacuum-sealed freshness, and generally smooth printing when tuned to the recommended settings, making it good value for functional prints and visible prototypes.

Frequently Asked Questions

Can I use this filament directly on my printer?
Answer. No, the filament is a refill and must be loaded onto a compatible reusable spool from SUNLU or Bambu Lab before use.

What print settings work best?
Answer. SUNLU recommends a nozzle temperature of 240-260C, bed temperature of 60-70C, and print speeds between 50-200mm/s; tuning may reduce stringing and adhesion issues.

Will the colors be accurate?
Answer. Customers report generally good color accuracy and vivid hues, including a bright neon tone, though final appearance can vary with print settings and lighting.