SUNLU PETG Filament Refill 1.75mm 4KG - High Speed Matte PETG

In this review the SUNLU PETG Filament Refill 1.75mm 4KG is evaluated for makers who want a no-spool, high speed PETG option for FDM printers. The core reason to consider it is simple: it combines PETG toughness with a refill format that reduces plastic waste while remaining compatible with many popular spools and AMS systems. For those who prioritize durability and impact resistance for functional parts, this refill bundle aims to deliver consistent print quality and faster throughput when paired with the recommended temperature and speed ranges.

Key Features

• Superior Compatibility: Works with SUNLU 2025 new spool, Bambu Lab spools and most FDM printers including AMS and AMS Lite, simplifying integration into existing setups.
• Easy To Install: The reusable SUNLU 3rd spools are clearly marked and designed to snap into place so even newcomers can load filament without fuss.
• Less Plastic: Refill rolls eliminate the need for full disposable spools, reducing plastic waste and lowering environmental impact across multiple prints.
• High Speed Printing: Engineered for rapid melting and smooth flow, the filament supports print speeds up to 600mm/s when using the advised higher nozzle temperatures.
• PLA and ABS Benefits: Delivers PLA-like ease of printing with stronger, more durable performance similar to ABS for functional parts that need toughness.
• Enhanced Toughness: Offers high impact strength for parts that must withstand bumps and drops without cracking.

Who It's For

The SUNLU PETG refill is best for hobbyists and small shops that print functional prototypes, brackets, or durable enclosures and want to cut down spool waste while maintaining good print speed and strength. It is also suited to users of Bambu Lab printers and SUNLU 2025 spools who need an affordable bulk option in multiple colors.

Users who rely on a different SUNLU detachable spool system should check compatibility before buying, and those who require perfectly wound, full-size spools for certain spool holders may prefer traditional spooled filament. Winding quality and spool fit received mixed feedback, so a test run is advisable for new setups.

Pros & Cons

Pros

• Good filament quality with reliable print performance and strong impact resistance for functional parts.
• Lower plastic waste through a refill system that pairs with reusable SUNLU 3rd spools.
• Supports a wide speed range with recommended temperature profiles for different print speeds.
• Broad compatibility with Bambu Lab and many FDM printers and AMS systems.

Cons

• Spool fit and winding quality are mixed according to customers; some report half-spool sizing that may not seat correctly in all holders.
• Not compatible with older SUNLU 2nd detachable spools, so buyer must confirm spool version before purchase.

Specifications

Material	PETG
Diameter	1.75mm
Total Weight	4KG (4 x 1KG rolls)
Compatibility	SUNLU 2025 spool, Bambu Lab spool, most FDM printers, AMS and AMS Lite
Recommended Print Temp	205-270C (varies by print speed)
Recommended Bed Temp	70-80C
Print Speed Range	30mm/s to 600mm/s (see recommended temp mapping)

Our Verdict

The SUNLU PETG Filament Refill 1.75mm 4KG is a practical choice for makers who want durable, impact resistant prints while reducing spool waste. It offers strong compatibility with modern reusable spools and good value for bulk purchasers, though buyers should confirm spool fit and accept that winding quality can vary. Overall it is a solid, cost-effective PETG refill for functional printing and faster workflows.

Frequently Asked Questions

Will this fit my Bambu Lab spool?
Yes, the refill is explicitly compatible with Bambu Lab spools, but verify your spool style since some older or third-party holders may differ.

What nozzle and bed temperatures should I use?
Use 205-215C for 50-100mm/s, 240-250C for 100-300mm/s, and 260-270C for 300-600mm/s with a bed at 70-80C; adjust by speed.

Are these full spools or refill rolls?
These are no-spool refill rolls intended for use with reusable SUNLU 3rd spools; they reduce plastic but require a compatible spool system.