SUNLU PETG Refill 1.75mm 4-Pack 500g Spools - Economical Tough

In this review of the SUNLU PETG Refill 1.75mm 4-pack the bottom line is simple: this kit is for makers who already own reusable spools from SUNLU or Bambu Lab and want a cost-effective, tough filament option. The reviewer found the PETG refill delivers reliable, smooth printing and strong, impact-resistant parts when used correctly on compatible reusable spools. It is not a drop-in spool replacement, so buyers must be prepared to load the refill onto an empty reusable spool before printing.

Key Features

• Refill format: Designed to be loaded onto SUNLU or Bambu Lab reusable spools, which cuts waste and lowers per-print cost.
• Material balance: Combines PETG and ABS advantages to yield high toughness with relatively easy handling compared with pure ABS.
• Enhanced durability: High impact strength makes printed parts more resistant to bumps and drops for functional prints that need longevity.
• Smooth output: Engineered to reduce stringing and clogging so prints are more consistent and require less troubleshooting.
• Vacuum packaging: Each spool refill is sealed in vacuum packaging to keep the filament dry and preserve print quality until use.
• Recommended settings: Clear nozzle and bed ranges are provided to help dial in prints quickly: nozzle 240-260C, bed 60-70C, speed 50-200mm/s.

Who It's For

This refill pack is aimed at intermediate and experienced hobbyists, small shops, or anyone with SUNLU or Bambu Lab reusable spools who wants to reduce filament cost and waste. The strength and impact resistance suit functional parts, fixtures, and prototypes that need to withstand handling and stress.

Beginners without reusable spools, or users who expect a ready-to-use factory spool, should look elsewhere or plan to acquire an empty compatible spool first. Also, if you need specialized filaments (flexible, high-temp, or abrasive grades) this general-purpose PETG refill may not meet those niche requirements.

Pros & Cons

Pros

• Good overall print quality with consistent diameter tolerance and reliable color accuracy.
• Durable, high-impact parts suitable for functional prints and end-use components.
• Economical 4-pack refill format lowers cost per job when you already own reusable spools.
• Vacuum-sealed packaging reduces moisture-related print issues out of the box.

Cons

• Cannot be used directly on a printer; requires an empty compatible reusable spool to load the refill.
• Some users report mixed experiences with adhesion and stringing, so settings may need fine tuning per printer.

Specifications

Brand	SUNLU
Material	PETG (refill)
Diameter	1.75 mm
Weight per spool	500 g
Pack size	4 spools (refill)
Dimensional accuracy	+/- 0.02 mm
Recommended temps	Nozzle 240-260C, Bed 60-70C

Our Verdict

The SUNLU PETG Refill 1.75mm 4-pack is a practical, value-oriented option for users who already own compatible reusable spools and need durable, impact-resistant filament for functional parts. With vacuum packaging and explicit temperature guidance it offers good printability and cost savings, though buyers should be prepared to fine tune settings to minimize stringing and ensure proper adhesion.

Frequently Asked Questions

Can I use this refill directly on any printer?
No. The refill must be loaded onto an empty reusable spool from SUNLU or Bambu Lab (or a compatible printed spool) before feeding into a printer.

What printing temps should I use?
Use a nozzle temperature of 240-260C and a bed temperature of 60-70C, with print speeds between 50-200 mm/s as a starting point.

How is filament stored before use?
The spools are vacuum-sealed to keep the filament dry and preserve quality from factory to first print.