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

In this review the SUNLU PETG Filament Refill 1.75mm 4KG is examined for makers and small workshops that want high-speed, durable prints without the waste of spooled filament. The bottom line: this refill set is best for users who already own compatible reusable spools like the SUNLU 2025 or Bambu Lab spool and value high impact strength and fast print speeds. For those seeking a matte black PETG that balances ease of use and toughness, it delivers consistent print quality and a good matte finish.

Key Features

• Superior Compatibility: Works with SUNLU 2025 new spool, Bambu Lab spool and many FDM printers including AMS and AMS Lite, making it easy to integrate into existing setups.
• Reusable Spool Design: The refill format removes the need for traditional spools, cutting plastic waste while still fitting into compatible reusable spools.
• High Speed Printing: Optimized for rapid printing with recommended ranges up to 600mm/s when paired with appropriate nozzle temperatures for fast prototyping.
• Enhanced Toughness: PETG combines PLA-like ease of use with ABS-like durability, producing parts that resist impacts and handle stress better than many filaments.
• Clear Installation Marks: Reusable spools are marked to align and snap into place, making installation straightforward for beginners.

Who It's For

This product is aimed at hobbyists, makers, and small production users who already own compatible reusable spools such as the SUNLU 2025 or Bambu Lab spool and need a robust matte black PETG for functional parts, prototypes, or quick turnaround jobs. It is also a good fit for those who prioritize reducing waste and want the convenience of refill rolls.

Users who should look elsewhere include people with the older sunlu 2rd detachable spool or those who require pre-spooled filament for printers that do not accept refill rolls; the listing explicitly notes incompatibility with that specific detachable spool. Also, if glossy finishes are required, another filament may be a better match than this matte black PETG.

Pros & Cons

Pros

• Strong, durable prints with high impact resistance suitable for functional parts.
• Fast melting and smooth flow enable higher print speeds when temperatures are adjusted accordingly.
• Matte black color gives consistent color quality and a professional finish.
• Refill format reduces plastic waste and supports reusable spools.

Cons

• Not compatible with the sunlu 2rd detachable spool, so buyers must confirm spool type before purchase.
• Some customers report mixed spool winding or fit issues with nonstandard spools, so setup may require attention.

Specifications

Material	PETG
Diameter	1.75mm
Total Weight	4KG (4 rolls of 1KG each)
Color	Matte Black
Compatible Spools	SUNLU 2025 new spool, Bambu Lab spool, most FDM printers, AMS, AMS Lite
Not Compatible	sunlu 2rd detachable spool
Recommended Bed Temp	70-80C

Our Verdict

The SUNLU PETG Filament Refill 1.75mm 4KG is a solid choice for makers who need a durable, matte black PETG and already use compatible reusable spools. It delivers reliable print quality, high impact strength and the ability to print at much faster speeds when you tune nozzle temperatures to the recommended ranges, offering good value while cutting down on spool waste.

Frequently Asked Questions

Is this compatible with my Bambu Lab spool?
Yes, the refill is explicitly compatible with Bambu Lab spool and SUNLU 2025 new spool, but confirm your spool model before buying.

What print temperatures are recommended?
Recommended settings vary by speed: 205-215C for 50-100mm/s, 240-250C for 100-300mm/s, and 260-270C for 300-600mm/s; bed temp 70-80C.

Will this reduce plastic waste?
Yes, the refill format is designed for reusable spools to reduce plastic waste compared with traditional spooled filament.