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SUNLU refills (no spool) filament, ranked by £/kg — on offer now

Every listing of SUNLU refills (no spool) filament we track on Amazon UK, ranked by £/kg.

2 currently discounted.

Product	Material	Weight	Rating	Price	Per kg	Deal
SUNLU PLA+ Filament Refill 1.75mm 4KG, No-Spool PLA Plus Refill for Reusable S	PLA+	4 kg refill	★★★★½ 4.5 out of 5 (257 Amazon ratings)	£33.60	£8.40	Like New · 21% under new
SUNLU 3D Printer Filament PETG Filament Refill 1.75mm,Suitable for SUNLU Third	PETG	4 kg refill	★★★★½ 4.5 out of 5 (177 Amazon ratings)	£37.73	£9.43	Like New · 7% under new

Refills (no spool) filament by brand

Guides

• Bed adhesion: what actually works
  Glue sticks, hairspray, rafts, brims and expensive surfaces — an honest ranking of what fixes prints coming loose, starting with the free fix that solves most cases.
• Do you need a filament dryer?
  Wet filament is real and ruins prints, but a dedicated dryer is not the only answer. How to tell if moisture is your problem, and what to do about it.
• Filament storage: dry boxes, vacuum bags and desiccant
  Keeping filament dry is cheaper than drying it out. What actually works, what desiccant to use, and why the little sachet in the bag is already spent.
• First layer calibration, properly
  Nearly every adhesion problem and half of all print failures start in the first layer. How to set Z offset by eye, and what a good first layer actually looks like.

Best-selling Filament by year — which actually sold best, going back several years, ranked by sales position rather than opinion.