SUNLU PA6-GF Glass Fiber Nylon Filament - 25% Glass Fiber Reinforced, High Temp & Corrosion Resistant Engineering Filament, ± Accuracy,1KG Spool (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.