PETG Refill 1.75mm 4-Pack Beige Coffee Olive Oak - Cost Saving PETG

In this review the SUNLU PETG Refill 1.75mm 4-pack is assessed for makers who already own reusable spools from SUNLU or Bambu Lab and want to cut filament costs without sacrificing durability. The bottom line: this refill bundle delivers strong, impact-resistant PETG in four natural shades and is a practical choice if you intend to load filament onto compatible empty spools. It is not a standalone spool product, so buyers should be prepared to transfer filament onto a reusable spool before printing.

Key Features

• Refill format: Designed to be installed on an empty reusable spool, the refill format lowers waste and cost when you already have compatible spools.
• PETG material: Combines toughness and ease of use to produce durable parts that resist cracking and handle stress better than many common filaments.
• Compatibility: Works with SUNLU and Bambu Lab reusable spools and can be used with printed or custom spools for broad printer support.
• Smooth printing: Engineered to reduce stringing and clogging so prints run more consistently when recommended settings are followed.
• Vacuum packaging: Each refill is sealed to stay moisture-free from the factory to the printer, preserving filament quality for reliable extrusion.

Who It's For

This product is aimed at hobbyists, small workshops, and educators who already use or plan to use reusable SUNLU or Bambu Lab spools and want to lower ongoing filament costs while keeping print quality consistent. It is especially useful for those printing functional parts that need higher impact resistance and toughness than standard PLA provides.

It is not for users expecting a ready-to-print spool out of the box; anyone without a compatible empty spool or who needs immediate plug-and-play spools should look for standard-wound filament spools instead. Also, users concerned about adhesion or machine-specific clogging should test settings and bed preparation before committing large runs.

Pros & Cons

Pros

• Good value: the economy pack reduces cost per kilogram when reusing empty spools.
• Durable prints: the PETG formulation provides high impact strength and toughness for functional parts.
• Reduced moisture issues: vacuum packaging helps keep filament dry and printable out of the box.

Cons

• Refill-only: cannot be used directly without an empty reusable spool, which some users find inconvenient.
• Mixed feedback on adhesion and stringing: some users report occasional adhesion and stringing or clog concerns that require tuning.

Specifications

Brand	SUNLU
Material	PETG
Diameter	1.75mm
Pack	4 spools (refill), 1kg each
Colors	Beige, Coffee Brown, Olive Green, Oak
Recommended nozzle temp	240-260C
Recommended bed temp	60-70C

Our Verdict

The SUNLU PETG Refill 1.75mm 4-pack is a sensible, cost-effective choice for users who own compatible reusable spools and need tougher, impact-resistant prints. It offers good color accuracy and reliable vacuum-sealed packaging, but buyers should be prepared to transfer filament to a spool and to fine-tune print settings to reduce stringing and adhesion issues. For the right workflow it represents strong value.

Frequently Asked Questions

Can I use these refills without a reusable spool?
Answer. No, these refills must be installed on an empty reusable spool from SUNLU or Bambu Lab before printing.

What print settings work best?
Answer. SUNLU recommends a nozzle of 240-260C, bed 60-70C and print speeds between 50-200mm/s; tuning may be needed per machine.

Will the vacuum packaging prevent moisture issues?
Answer. Yes, vacuum sealing helps keep the filament dry for storage and shipping, but long-term storage after opening still benefits from a filament dryer or resealed container.