SUNLU Silk Rainbow PLA Filament, Multicolor Silk 3D Printer Filament +/-, Fast Color Change Each 8 Meters, 330 Meters, 1kg/2.2lbs, Silk Rainbow Filament(Blue-Purple-Magenta)

Well-known as much for their S1/S2 filament dryers as for the filament itself. The material catalog — PLA, PETG, ABS, TPU, silk — is broad and frequently discounted on Amazon. Solid all-around option.