SUNLU PETG Refill 1.75mm 4-Pack Grey - Durable, Cost-Saving Refill

In this review of the SUNLU PETG Refill 1.75mm 4-pack, the bottom line is simple: this pack is aimed at makers who already own reusable spools from SUNLU or Bambu Lab and want a reliable, economical PETG option. The refill delivers good toughness and smooth printing characteristics while cutting material cost by reusing spools. It is not a standalone spool and must be loaded onto an empty reusable spool before use, which is the single most important detail to understand before buying.

Key Features

• Refill format: Designed to be wound onto SUNLU or Bambu Lab reusable spools, the refill format reduces packaging waste and lowers ongoing filament costs.
• Material blend: PETG refill combines PETG and ABS advantages to give higher toughness and easier handling compared with some pure PLA options.
• Compatibility: Fully compatible with SUNLU and Bambu Lab reusable spools and can be rewound onto a 3D-printed spool for use with most printers.
• Printability: Engineered to reduce stringing and clogging so users typically see smooth, consistent extrusion across prints.
• Packaging: Vacuum sealed to stay moisture-free from factory to printer, which helps preserve print quality for longer storage.
• Recommended settings: Nozzle 240-260C and bed 60-70C provide a practical starting window for dialing in print quality and adhesion.

Who It's For

This refill pack suits hobbyists, small workshops, and makers who already own reusable spools from SUNLU or Bambu Lab and want to lower material costs without sacrificing toughness. It fits projects that need parts with good impact resistance such as functional brackets, tool holders, and wearable prototypes.

It is not ideal for buyers who expect a ready-to-use spool out of the box; you must have or make a compatible spool first. Also, if absolute glasslike surface finish or ultra-fine detail is the priority, other specialty filaments may be a better fit.

Pros & Cons

Pros

• Consistent filament quality that yields smooth, reliable prints when settings are dialed in.
• High impact strength and enhanced toughness make parts more durable under stress.
• Economy 4-pack lowers per-kg cost for frequent printing and reduces spool waste.
• Vacuum packaging helps prevent moisture-related print issues.

Cons

• Cannot be used directly; requires an empty reusable spool from SUNLU or Bambu Lab or a printed spool, which adds a setup step.
• Customer reports show mixed results on adhesion and stringing in some printers, so tuning may be necessary for optimal results.

Specifications

Filament type	PETG refill
Diameter	1.75 mm
Tolerance	Dimensional accuracy +/- 0.02 mm
Weight per unit	1 kg per spool (4 pack included)
Color	Grey (4 pack)
Recommended nozzle temp	240-260C
Recommended bed temp	60-70C

Our Verdict

The SUNLU PETG Refill 1.75mm 4-pack is a practical, value-focused choice for makers who use reusable spools and need a tough, impact-resistant filament. It delivers generally smooth prints and good color consistency while cutting costs per spool, though buyers should be prepared to load it onto a compatible spool and fine tune printer settings for the best adhesion and stringing control.

Frequently Asked Questions

Can I use this refill directly on my printer?
No. The refill must be installed on an empty reusable spool from SUNLU or Bambu Lab or rewound onto a compatible spool before printing.

What printing settings should I start with?
Begin with a nozzle temperature of 240-260C, bed temperature of 60-70C and print speed between 50-200 mm/s, then adjust for your printer and model.

How is the filament packaged for storage?
Each refill is vacuum sealed to remain moisture-free during storage and shipping, helping preserve print quality.