If you’ve ever wanted to print a model with multiple colors on a single extruder 3D printer the Rainbow Silk PLA filament is definitely
Rainbow Silk PLA Filament - 3D Printing with a Color Gradient
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Type A - Rainbow Silk PLA Filament - 1.75mm, 1 kg – 3D Printing Canada
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Rainbow Silk PLA Filament - 3D Printing with a Color Gradient
Amolen Silk Multicolor Rainbow PLA Filament