SUNLU PLA+ Silk Filament, Four-Color 3D Printer Filament, Dimensional Accuracy +/-, 1KG Spool(2.2 lbs), Silk Quadruple Color(Red Yellow Green Black)

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.