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Cookiecad rainbow & gradient filament, ranked by £/kg

Every listing of Cookiecad rainbow & gradient filament we track on Amazon UK, ranked by £/kg.

3 listings tracked, 2 on offer right now.

Product	Material	Weight	Rating	Price	Per kg	Deal
Cookiecad Mermaid (Purple->Blue->Green Rainbow Transition) PLA 3D Printer Fila	PLA	1 kg	—	£28.58	£28.58	—
Cookiecad Silk PLA Filament 1.75mm 1kg Dual Color Rainbow 3D Printer Filament	PLA	1 kg	4.5 out of 5 (14 Amazon ratings)	£29.85	£29.85	45% below
Cookiecad Sunset (Pink -> Purple -> Blue Rainbow Transition) PLA 3D Printer Fi	PLA	1 kg	4.6 out of 5 (1,006 Amazon ratings)	£44.80	£44.80	17% below

Rainbow & gradient filament by brand

Does glow in the dark filament really work?
Yes, with caveats the listings leave out. How bright it gets, how long it lasts, which colour glows best, how to print it for the strongest glow, and why it eats brass nozzles.
Filament bundles: are they worth it?
Multi-kilo bundles roughly halve the price per kilogram, and small sample sets cost three times as much. The real numbers by pack size, and when each one is the right buy.
High-speed PLA: what it is and who needs it
High-speed PLA is a real reformulation that melts and flows faster, not just a label. What changes, the flow-rate number that decides whether you need it, and what it costs.
How many filament colours do you need?
You want all of them. You will use about four. How to decide which filament colours earn their shelf space, in what order to buy them, and which ones to try in small quantities first.

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