SUNLU PA12-CF Carbon Fiber Nylon Filament - High Precision Engineering Filament with Excellent Wear & Oil Resistance, Big Roll Filament, 2.7kg Spool (5.95 lbs), 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.