SUNLU High Speed PLA Meta Filament Bundle Black 4KG, PLA 3D Printer Filament ±, Tougher Neatly Wound 3D Filament, Individually Vacuum Packed, 1kg per Spool, 4 Packs 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.