We track 2,074 blue filament listings from 211 brands, with prices checked every 4 hours and normalized to a true cost per kilogram.
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The four cheapest 1kg spools by price per kg, each from a different brand.
KINGROON PLA 3D Printer Filament 1.75mm, Sea Blue, 10kg (10 x 1kg)
KINGROON PLA 3D Printer Filament Bulk, 10KG 10-Pack, Glacier Blue
ONENPOXARY PLA Plus1.75mm 6KG Bundles Blue Series PLA+ 3D Printer Filament
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